space travel is

The future of spaceflight—from orbital vacations to humans on Mars

NASA aims to travel to the moon again—and beyond. Here’s a look at the 21st-century race to send humans into space.

Welcome to the 21st-century space race, one that could potentially lead to 10-minute space vacations, orbiting space hotels , and humans on Mars. Now, instead of warring superpowers battling for dominance in orbit, private companies are competing to make space travel easier and more affordable. This year, SpaceX achieved a major milestone— launching humans to the International Space Station (ISS) from the United States —but additional goalposts are on the star-studded horizon.

Private spaceflight

Private spaceflight is not a new concept . In the United States, commercial companies played a role in the aerospace industry right from the start: Since the 1960s, NASA has relied on private contractors to build spacecraft for every major human spaceflight program, starting with Project Mercury and continuing until the present.

Today, NASA’s Commercial Crew Program is expanding on the agency’s relationship with private companies. Through it, NASA is relying on SpaceX and Boeing to build spacecraft capable of carrying humans into orbit. Once those vehicles are built, both companies retain ownership and control of the craft, and NASA can send astronauts into space for a fraction of the cost of a seat on Russia’s Soyuz spacecraft.

SpaceX, which established a new paradigm by developing reusable rockets , has been running regular cargo resupply missions to the International Space Station since 2012. And in May 2020, the company’s Crew Dragon spacecraft carried NASA astronauts Doug Hurley and Bob Behnken to the ISS , becoming the first crewed mission to launch from the United States in nearly a decade. The mission, called Demo-2, is scheduled to return to Earth in August. Boeing is currently developing its Starliner spacecraft and hopes to begin carrying astronauts to the ISS in 2021.

Other companies, such as Blue Origin and Virgin Galactic , are specializing in sub-orbital space tourism. Test launch video from inside the cabin of Blue Origin’s New Shepard shows off breathtaking views of our planet and a relatively calm journey for its first passenger, a test dummy cleverly dubbed “Mannequin Skywalker.” Virgin Galactic is running test flights on its sub-orbital spaceplane , which will offer paying customers roughly six minutes of weightlessness during its journey through Earth’s atmosphere.

With these and other spacecraft in the pipeline, countless dreams of zero-gravity somersaults could soon become a reality—at least for passengers able to pay the hefty sums for the experience.

Early U.S. Spaceflight

the Apollo 1 crew in 1967

Looking to the moon

Moon missions are essential to the exploration of more distant worlds. After a long hiatus from the lunar neighborhood, NASA is again setting its sights on Earth’s nearest celestial neighbor with an ambitious plan to place a space station in lunar orbit sometime in the next decade. Sooner, though, the agency’s Artemis program , a sister to the Apollo missions of the 1960s and 1970s, is aiming to put the first woman (and the next man) on the lunar surface by 2024.

LIMITED TIME OFFER

Get a FREE tote featuring 1 of 7 ICONIC PLACES OF THE WORLD

Extended lunar stays build the experience and expertise needed for the long-term space missions required to visit other planets. As well, the moon may also be used as a forward base of operations from which humans learn how to replenish essential supplies, such as rocket fuel and oxygen, by creating them from local material.

You May Also Like

space travel is

In a first, NASA Mars lander feels shockwaves from meteor impacts

space travel is

SpaceX takes 4 passengers to orbit—a glimpse at private spaceflight’s future

space travel is

Why go back to the moon? NASA’s Artemis program has even bigger ambitions

Such skills are crucial for the future expansion of human presence into deeper space, which demands more independence from Earth-based resources. And although humans have visited the moon before, the cratered sphere still harbors its own scientific mysteries to be explored—including the presence and extent of water ice near the moon's south pole, which is one of the top target destinations for space exploration .

NASA is also enlisting the private sector to help it reach the moon. It has awarded three contracts to private companies working on developing human-rated lunar landers—including both Blue Origin and SpaceX. But the backbone of the Artemis program relies on a brand new, state-of-the-art spacecraft called Orion .

Archival Photos of Spaceflight

a 19th-century hot air balloon being inflated.

Currently being built and tested, Orion—like Crew Dragon and Starliner—is a space capsule similar to the spacecraft of the Mercury, Gemini, and Apollo programs, as well as Russia’s Soyuz spacecraft. But the Orion capsule is larger and can accommodate a four-person crew. And even though it has a somewhat retro design, the capsule concept is considered to be safer and more reliable than NASA’s space shuttle—a revolutionary vehicle for its time, but one that couldn’t fly beyond Earth’s orbit and suffered catastrophic failures.

Capsules, on the other hand, offer launch-abort capabilities that can protect astronauts in case of a rocket malfunction. And, their weight and design mean they can also travel beyond Earth’s immediate neighborhood, potentially ferrying humans to the moon, Mars, and beyond.

A new era in spaceflight

By moving into orbit with its Commercial Crew Program and partnering with private companies to reach the lunar surface, NASA hopes to change the economics of spaceflight by increasing competition and driving down costs. If space travel truly does become cheaper and more accessible, it’s possible that private citizens will routinely visit space and gaze upon our blue, watery home world—either from space capsules, space stations, or even space hotels like the inflatable habitats Bigelow Aerospace intends to build .

The United States isn’t the only country with its eyes on the sky. Russia regularly launches humans to the International Space Station aboard its Soyuz spacecraft. China is planning a large, multi-module space station capable of housing three taikonauts, and has already launched two orbiting test vehicles—Tiangong-1 and Tiangong-2, both of which safely burned up in the Earth’s atmosphere after several years in space.

Now, more than a dozen countries have the ability to launch rockets into Earth orbit. A half-dozen space agencies have designed spacecraft that shed the shackles of Earth’s gravity and traveled to the moon or Mars. And if all goes well, the United Arab Emirates will join that list in the summer of 2020 when its Hope spacecraft heads to the red planet . While there are no plans yet to send humans to Mars, these missions—and the discoveries that will come out of them—may help pave the way.

Related Topics

  • SPACE EXPLORATION
  • SCIENCE AND TECHNOLOGY

space travel is

Second SpaceX megarocket launch ends with another explosion. What happens next?

space travel is

Why did India land near the moon’s south pole?

space travel is

In the Arizona desert, NASA prepares for walking on the moon

space travel is

U.S. returns to the moon as NASA's Odysseus successfully touches down

space travel is

The moon’s darkest corners are a mystery. This image offers a stunning new glimpse.

  • Paid Content
  • Environment

History & Culture

  • History & Culture
  • History Magazine
  • Mind, Body, Wonder
  • Destination Guide
  • Terms of Use
  • Privacy Policy
  • Your US State Privacy Rights
  • Children's Online Privacy Policy
  • Interest-Based Ads
  • About Nielsen Measurement
  • Do Not Sell or Share My Personal Information
  • Nat Geo Home
  • Attend a Live Event
  • Book a Trip
  • Inspire Your Kids
  • Shop Nat Geo
  • Visit the D.C. Museum
  • Learn About Our Impact
  • Support Our Mission
  • Advertise With Us
  • Customer Service
  • Renew Subscription
  • Manage Your Subscription
  • Work at Nat Geo
  • Sign Up for Our Newsletters
  • Contribute to Protect the Planet

Copyright © 1996-2015 National Geographic Society Copyright © 2015-2024 National Geographic Partners, LLC. All rights reserved

  • Subscribe to BBC Science Focus Magazine
  • Previous Issues
  • Future tech
  • Everyday science
  • Planet Earth
  • Newsletters

Everything you need to know about space travel (almost)

We're a long way from home...

Paul Parsons

When did we first start exploring space?

The first human-made object to go into space was a German V2 missile , launched on a test flight in 1942. Although uncrewed, it reached an altitude of 189km (117 miles).

Former Nazi rocket scientists were later recruited by both America and Russia (often at gunpoint in the latter case), where they were instrumental in developing Intercontinental Ballistic Missiles (ICBMs) – rockets capable of carrying nuclear weapons from one side of the planet to the other.

A captured German V-2 rocket, the world’s first guided missile, launched at the US Army testing base at White Sands, in New Mexico © Getty Images

It was these super-missiles that formed the basis for the space programmes of both post-war superpowers. As it happened, Russia was the first to reach Earth orbit, when it launched the uncrewed Sputnik 1 in October 1957, followed a month later by Sputnik 2, carrying the dog Laika – the first live animal in space.

The USA sent its first uncrewed satellite, Explorer 1, into orbit soon after, in January 1958. A slew of robotic spaceflights followed, from both sides of the Atlantic, before Russian cosmonaut Yuri Gagarin piloted Vostok 1 into orbit on 12 April 1961, to become the first human being in space . And from there the space race proper began, culminating in Neil Armstrong and Buzz Aldrin becoming the first people to walk on the Moon as part of NASA's Apollo programme .

Why is space travel important?

Space exploration is the future. It satisfies the human urge to explore and to travel, and in the years and decades to come it could even provide our species with new places to call home – especially relevant now, as Earth becomes increasingly crowded .

Extending our reach into space is also necessary for the advancement of science. Space telescopes like the Hubble Space Telescope and probes to the distant worlds of the Solar System are continually updating, and occasionally revolutionising, our understanding of astronomy and physics.

  • Subscribe to the Science Focus Podcast on these services: Acast , iTunes , Stitcher , RSS , Overcast

But there are also some very practical reasons, such as mining asteroids for materials that are extremely rare here on Earth.

One example is the huge reserve of the chemical isotope helium-3 thought to be locked away in the soil on the surface of the Moon . This isotope is a potential fuel for future nuclear fusion reactors – power stations that tap into the same source of energy as the Sun. Unlike other fusion fuels, helium-3 gives off no hard-to-contain and deadly neutron radiation.

However, for this to happen the first challenge to overcome is how to build a base on the Moon. In 2019, China's Chang’e 4 mission marked the beginning of a new space race to conquer the Moon, signalling their intent to build a permanent lunar base , while the NASA Artemis mission plans to build a space station, called Lunar Orbital Platform-Gateway , providing a platform to ferry astronauts to the Moon's surface.

Could humans travel into interstellar space and how would we get there?

It’s entirely feasible that human explorers will visit the furthest reaches of our Solar System. The stars, however, are another matter. Interstellar space is so vast that it takes light – the fastest thing we know of in the Universe – years, centuries and millennia to traverse it. Faster-than-light travel may be possible one day, but is unlikely to become a reality in our lifetimes.

It’s not impossible that humans might one day cross this cosmic gulf, though it won’t be easy. The combustion-powered rocket engines of today certainly aren’t up to the job – they just don’t use fuel efficiently enough. Instead, interstellar spacecraft may create a rocket-like propulsion jet using electric and magnetic fields. This so-called ‘ ion drive ’ technology has already been tested aboard uncrewed Solar System probes.

Star Trek's USS Enterprise, the iconic warp-capable ship © Alamy

Another possibility is to push spacecraft off towards the stars using the light from a high-powered laser . A consortium of scientists calling themselves Breakthrough Starshot is already planning to send a flotilla of tiny robotic probes to our nearest star, Proxima Centauri, using just this method.

Though whether human astronauts could survive such punishing acceleration, or the decades-long journey through deep space, remains to be seen.

How do we benefit from space exploration?

Pushing forward the frontiers of science is the stated goal of many space missions . But even the development of space travel technology itself can lead to unintended yet beneficial ‘spin-off’ technologies with some very down-to-earth applications.

Notable spin-offs from the US space programme, NASA, include memory foam mattresses, artificial hearts, and the lubricant spray WD-40. Doubtless, there are many more to come.

Read more about space exploration:

  • The next giant leaps: The UK missions getting us to the Moon
  • Move over, Mars: why we should look further afield for future human colonies
  • Everything you need to know about the Voyager mission
  • 6 out-of-this-world experiments recreating space on Earth

Space exploration also instils a sense of wonder, it reminds us that there are issues beyond our humdrum planet and its petty squabbles, and without doubt it helps to inspire each new generation of young scientists. It’s also an insurance policy. We’re now all too aware that global calamities can and do happen – for instance, climate change and the giant asteroid that smashed into the Earth 65 million years ago, leading to the total extinction of the dinosaurs .

The lesson for the human species is that we keep all our eggs in one basket at our peril. On the other hand, a healthy space programme, and the means to travel to other worlds, gives us an out.

Is space travel dangerous?

In short, yes – very. Reaching orbit means accelerating up to around 28,000kph (17,000mph, or 22 times the speed of sound ). If anything goes wrong at that speed, it’s seldom good news.

Then there’s the growing cloud of space junk to contend with in Earth's orbit – defunct satellites, discarded rocket stages and other detritus – all moving just as fast. A five-gram bolt hitting at orbital speed packs as much energy as a 200kg weight dropped from the top of an 18-storey building.

Sandra Bullock repairs the Hubble Telescope with George Clooney in Gravity © Warner Brothers

And getting to space is just the start of the danger. The principal hazard once there is cancer-producing radiation – the typical dose from one day in space is equivalent to what you’d receive over an entire year back on Earth, thanks to the planet’s atmosphere and protective magnetic field.

Add to that the icy cold airless vacuum , the need to bring all your own food and water, plus the effects of long-duration weightlessness on bone density, the brain and muscular condition – including that of the heart – and it soon becomes clear that venturing into space really isn’t for the faint-hearted.

When will space travel be available to everyone?

It’s already happening – that is, assuming your pockets are deep enough. The first self-funded ‘space tourist’ was US businessman Dennis Tito, who in 2001 spent a week aboard the International Space Station (ISS) for the cool sum of $20m (£15m).

Virgin Galactic has long been promising to take customers on short sub-orbital hops into space – where passengers get to experience rocket propulsion and several minutes of weightlessness, before gliding back to a runway landing on Earth, all for $250k (£190k). In late July 2020, the company unveiled the finished cabin in its SpaceShipTwo vehicle, suggesting that commercial spaceflights may begin shortly.

SpaceX expect that one day their Starship could carry passengers to the Moon © SpaceX/Flickr

Meanwhile, Elon Musk’s SpaceX , which in May 2020 became the first private company to launch a human crew to Earth orbit aboard the Crew Dragon , plans to offer stays on the ISS for $35k (£27k) per night. SpaceX is now prototyping its huge Starship vehicle , which is designed to take 100 passengers from Earth to as far afield as Mars for around $20k (£15k) per head. Musk stated in January that he hoped to be operating 1,000 Starships by 2050.

10 Short Lessons in Space Travel by Paul Parsons is out now (£9.99, Michael O'Mara)

  • Buy now from Amazon UK , Foyles , WH Smith and Wordery

Share this article

space travel is

  • Terms & Conditions
  • Privacy policy
  • Cookies policy
  • Code of conduct
  • Magazine subscriptions
  • Manage preferences
  • Skip to main content
  • Keyboard shortcuts for audio player

3 predictions for the future of space exploration — including your own trips

Headshot of Alejandra Marquez Janse.

Alejandra Marquez Janse

Mary Louise Kelly, photographed for NPR, 6 September 2022, in Washington DC. Photo by Mike Morgan for NPR.

Mary Louise Kelly

Tinbete Ermyas

space travel is

Peggy Whitson says more widely available space tourism is realistic. Axiom Space hide caption

Peggy Whitson says more widely available space tourism is realistic.

If you've ever traveled somewhere that left you so enthralled that you wanted to go back over and over, then you get how Peggy Whitson feels about space.

She is a seasoned astronaut who has multiple achievements under her belt: She was the first woman to command the International Space Station, and in 2017 broke the record for most cumulative days in space of any American and female astronaut, with a count of 665.

Whitson retired from NASA nearly five years ago, but last month, at age 63, she packed up the necklace she wore on her wedding day, zipped her spacesuit one more time, and took flight in a SpaceX capsule as commander of the Ax-2 mission. It was sponsored by a private company, Axiom Space, where she now works as the director of human spaceflight. Three paying crew members traveled with her.

After returning to Earth, Whitson spoke with All Things Considered host Mary Louise Kelly and shared a few thoughts about the future of space exploration.

This interview has been edited slightly for clarity and brevity.

space travel is

The Ax-2 crew in a training session. The group, composed of Whitson (far left) and three paying costumers, spent nine days in space last month. Axiom Space hide caption

The Ax-2 crew in a training session. The group, composed of Whitson (far left) and three paying costumers, spent nine days in space last month.

1. Space exploration will be a mix of public and private money

If you look at even the NASA missions returning to the moon, lots of different private space companies are involved in that process. And that includes Axiom Space, for instance, who are building the spacesuits that will be used by the NASA astronauts as they step on the moon again. So it's exciting to be part of this changing philosophy of space and the efforts of commercial companies like Axiom Space. We intend to build the first commercial space station initially attached to the International Space Station, but to undock before the space station is decommissioned.

I think it's a worldwide relationship between different companies and peoples, and that's what makes it such a special time to be a part of the [Ax-2] mission, because [space exploration] is changing flavor and it's exciting because there are going to be many more opportunities in the future.

space travel is

The Ax-2 crew returns to Earth. Could this be you one day? Axiom Space hide caption

2. More people will be able to go to space

Obviously some of it will take time to make it not cost-prohibitive, but the fact that we are taking those initial steps is really important now. If you look back at commercial aviation and how that occurred and the development of that process, you know, it also started off to be only a few people could be involved and then later more and more, and so now it's pretty commonplace. I like to think that we're doing some of the same steps in commercial spaceflight now.

3. The goals depend on the person — and the country — that's traveling

Well, the objective of the mission is slightly different, obviously. My personal roles and responsibilities of taking care of the crew and ensuring their safety obviously are very similar. But our objectives were, we had one private astronaut, John Shoffner, who was trying to develop science, technology, engineering and math (STEM) outreach products for educators in the future, as well as doing research. And then we had two government sponsored astronauts from Saudi Arabia – the first female Saudi Arabian to fly in space and go to the International Space Station – and the second male to arrive.

SpaceX mission returns from space station with ex-NASA astronaut, 3 paying customers

SpaceX mission returns from space station with ex-NASA astronaut, 3 paying customers

So the objectives of the crew weren't all that much different necessarily than a NASA mission, which is outreach and scientific investigations, but these were with the specific goals of expanding outreach in specific areas for Saudi – which hadn't had a person in space for 40 years – and, you know, to inspire their youth as well as inspiring the youth in the United States.

To revisit this article, visit My Profile, then View saved stories .

  • Backchannel
  • Newsletters
  • WIRED Insider
  • WIRED Consulting

Ramin Skibba

Here’s a Sneak Peek at the Far-Out Future of Space Travel

moon landscape

From Star Trek–like medical scanners to concepts for off-planet agriculture like in The Expanse , science fiction has often inspired actual research at NASA and other space agencies. This week, researchers are meeting at a virtual conference for the NASA Innovative Advanced Concepts (NIAC) program to brainstorm and investigate sci-fi-like ideas, some of which may very well shape the missions of the next 20 years.

A drone helicopter hopping about a Martian crater or a lunar rover that maps moon ice might have seemed far-fetched a decade ago, but the copter actually flew earlier this year, and the rover is in the planning stages. Now the conference organizers have solicited proposals for more exploratory projects, a few of which the agency might eventually fund. “We invest in long-term, far-out technologies, and most of them probably won’t work. The ones that do might change everything. It’s high risk, high payoff, almost like a venture capital investment portfolio,” says Jason Derleth, the NIAC program executive.

The program isn’t focused on incremental developments but instead seeks game-changing technologies, ones that are 10 times better than the state of the art, Derleth says. He likens it to the Pentagon’s Defense Advanced Research Projects Agency, which also explores extremely speculative concepts but developed the precursor to the modern internet, among other innovations.

The annual conference , which continues through Thursday, September 23, is publicly viewable on NIAC’s livestream . Some of the proposals discussed so far—such as for new ways to launch foldable space stations or astronaut habitats, or to extract resources from other worlds—revolve around the understanding that, for lengthy space voyages, you have to make the most of every rocket launch.

The next generation of space travelers will need resources for survival, for protective structures, and to fuel the journey further or return home. “This leaves us with two options: Take everything with us, like if you were going on a hiking trip in the desert. Or find new and creative ways to use whatever is already there,” says Amelia Greig, an aerospace engineer at University of Texas at El Paso, who presented at the conference on Tuesday.

To aid creative reuse of lunar resources, Greig and her colleagues propose a technology called ablative arc mining, which would slurp up water ice and the kinds of metals that could be used as building materials. “It’s like using controlled lightning bolts to mine the moon,” she said during her presentation. Her concept describes a van-sized moon crawler—named after the Jawa sandcrawlers of Star Wars —that picks a spot, and then places a ringed device that it carries on its front end parallel to the ground. Electric arcs zap across the ring, which can be made as large as a meter in diameter, ripping particles from the moon’s surface. Those particles, now charged, can then be moved and sorted by the machine’s electromagnetic fields. That way, rather than scoping just one resource, a single piece of equipment could fill one container with water, another with oxygen attached to other elements, and others with silicon, aluminum, or other metal particles.

The Keys to a Long Life Are Sleep and a Better Diet&-and Money

Matt Reynolds

Fisker Suspends Its EV Production

Jeremy White

The Kate Middleton Photo’s Most Glaring Photoshop Mistakes

Reece Rogers

What Would Happen if Every American Got a Heat Pump

An artistic representation of the ablative arc mining system deployed into a crater near the lunar south pole.

But, like all early concepts, it faces practical challenges that would have to be overcome: In this case, the moon’s dusty environment could cause problems by getting stuck in the machinery, which would have to be made dust-proof. To hunt for water ice, the crawlers also will have to trundle into permanently shadowed craters, which contain water at about 6 percent by mass but are extremely cold and dark. The crawlers’ electronics would have to be designed to operate in those rugged conditions and with a non-solar power source. It also would be tough for any astronaut to oversee them, though they could monitor the mining from the crater’s rim. NASA estimates that permanent lunar settlements will need around 10,000 kilograms of water per year. That would require at least 20 of these kinds of crawlers roving about, gradually collecting those supplies, unless this technology was supplemented with something else. For now, Greig just hopes to test a smaller demonstration version of the crawler in a few years.

Space mining projects have also prompted ethical questions. For example, scientists and others have raised concerns about lunar mining permanently changing the look of the moon in the night sky. But Greig points out that ablative arc mining wouldn’t look like the environmentally harmful pit mines on Earth; the mining region could be spread out, making some craters only slightly deeper. And as for sustainability issues, she says, “there’s enough water to last human settlements hundreds of years.”

Stop-motion representation of the arc mining process on the lunar surface.

As a potential launching point for moon-goers and expeditions to deep space, NASA has proposed a space station orbiting the moon called the Lunar Gateway . But Zachary Manchester, a roboticist at Carnegie Mellon University in Pittsburgh, argues that the limited size of rockets allows few options for launching large structures for a lunar station. “If you want something that’s bigger than a rocket fairing, which is at most a few meters, it has to get launched in multiple rockets and assembled in orbit, like the International Space Station . Or it has to somehow get scrunched up into that rocket and then somehow expand out,” Manchester says.

At a session Wednesday, he and Jeffrey Lipton, a mechanical engineer at the University of Washington, proposed a space station that would fit into that confined space. Then, once deployed, it would unfold autonomously, like origami, into a full-sized structure, some 150 times bigger than its folded size. Preliminary designs involve a many-jointed structure made of titanium, aluminum, or another metal.

Since future astronauts will likely be on-station for a while, it would need to rotate to generate artificial gravity to avoid the deleterious health effects of prolonged periods in zero-G. But humans are sensitive to spinning; no one wants to live on a merry-go-round. “If you try to build a rotating space habitat, the only way to do it without making people motion-sick is to spin at up to two revolutions per minute,” Manchester says. To produce Earth-like gravity, such a space station needs to be a kilometer across, he argues. Yet squishing such a massive structure into a tiny space until it’s deployed poses a significant engineering challenge. In addition, to make their idea a reality, Manchester and Lipton ultimately need to figure out how to make the unfolding process not get jammed, despite the structure’s thousands of links and joints.

render of moon satellite

An artist's illustration of the Lunar Gateway in orbit around the moon.

Like packing for the biggest road trip ever, NASA will face similar challenges when fitting everything needed for moon or Mars structures onto rockets. To lighten the load, some scientists have suggested using Martian rocks as material for 3D-printing parts of structures. (A simulated lunar regolith is currently being test-printed aboard the International Space Station.) But Lynn Rothschild, an astrobiologist at NASA Ames Research Center in Mountain View, California, has a completely different idea: making structures out of mushrooms—or “mycotecture,” as she calls it. “The humble mushroom can provide an unbelievable building material. It’s completely natural, compostable, and the ultimate green building,” Rothschild says.

Although fungi could be used to grow the material for actual bricks and mortar that astronauts could use for construction, the best kind of space habitat would be assembled before they even arrive. Her team’s proposal involves launching a lander that would include plastic scaffolding and fungal mycelia, white filaments that make the root structure of fungi. (Like yeasts, mycelia can survive for a while without being fed.) The scaffolding would be a lattice of square hollow plastic cells, stitched into layers to make the shape of the final structure. On Mars, it would inflate to perhaps the size of a garage. Using water and oxygen—at least some of which would likely have been sourced or generated on Mars—the fungi would grow along those stitches and fill the cells, eventually turning a tent-like structure into a full-fledged building.

For strength and protection from space radiation, Rothschild thinks some kind of dark fungi could do the trick. “Black fungi—they make you say ‘Blecch,’ they look kind of disgusting. But the black pigment tends to protect from radiation, protecting the fungi and the people inside the habitat,” Rothschild says. She hopes to send a prototype to the International Space Station in the next few years.

Unlike the moon, Mars was once friendly to life . So Rothschild is designing the scaffolding to prevent any chance of renegade fungi escaping beyond the astronauts’ structures. (The last thing NASA wants is for a search for life on other worlds to turn up something that actually came from Earth .) In her team’s design, the fungi are essentially “double-bagged,” with an extra layer in the plastic lattice to ensure they all stay in.

To address those issues, space agencies have “planetary protection” experts like Moogega Cooper, supervisor of the Biotechnology and Planetary Protection Group at Jet Propulsion Laboratory in Pasadena, California, who spoke at the NIAC conference. “Anywhere you are possibly interacting with liquid water that is inherent to the place, your exploring would definitely catch our attention. Where you find water you may find life,” she says. The United States is one of the original signatories of the Outer Space Treaty, which requires that every space agency or company that wants to send a mission to an alien world make sure the spacecraft and all the equipment aboard are sterilized.

While the NIAC program has a budget of just $8.5 million per year, it supports many exploratory projects. A few of the ideas presented at this week’s conference could go on to the next level, or could get picked up by other agencies or private companies, as in the case of an earlier proposal to propel a smartphone-sized spacecraft to another stellar system with lasers, which inspired Breakthrough Starshot, a privately funded enterprise. Among a few of the topics on the menu for the rest of Wednesday and Thursday: multiple presentations about moon-based radio telescopes , as well as one about personal rovers for astronauts (since Artemis astronauts will be carrying 220-pound packs) and one about planting mushrooms in space regolith to make a more Earth-like growing soil.

“All of the concepts that are awarded are pushing the edge of our understanding, and they really allow us to take science fiction and make it science fact,” Cooper says.

  • 📩 The latest on tech, science, and more: Get our newsletters !
  • Rain boots, turning tides, and the search for a missing boy
  • Better data on ivermectin is finally on the way
  • A bad solar storm could cause an “internet apocalypse”
  • New York City wasn't built for 21st-century storms
  • 9 PC games you can play forever
  • 👁️ Explore AI like never before with our new database
  • 🎮 WIRED Games: Get the latest tips, reviews, and more
  • 🏃🏽‍♀️ Want the best tools to get healthy? Check out our Gear team’s picks for the best fitness trackers , running gear (including shoes and socks ), and best headphones

space travel is

Eric Berger, Ars Technica

Is This New 50-Year Battery for Real?

Rhett Allain

How to Stay Cool Without Warming the Planet

Sabrina Weiss

The 4 Big Questions the Pentagon’s New UFO Report Fails to Answer

Garrett M. Graff

A Tragic Tower Block Fire Exposes the World’s Failing Fire Regulations

Alex Christian

The Designer Who’s Trying to Transform Your City Into a Sponge

Advertisement

Comment and Space

Why space is the impossible frontier.

By Theunis Piersma

10 November 2010

New Scientist Default Image

Encouraging words, but could our bodies handle it?

(Image: NASA)

Dreams of long-haul space travel or even colonisation ignore basic biological constraints that anchor us firmly to the Earth, argues Theunis Piersma

AT A news conference before his first experience of weightlessness in 2007, theoretical physicist Stephen Hawking said that he hoped his zero-gravity flight would encourage public interest in space exploration. He argued that with an ever-increasing risk of wiping ourselves out on Earth, humans would need to colonise space.

Hawking has since argued that we must do this within two centuries or else face extinction . He was no doubt encouraged by US President Barack Obama’s announcement in April this year of a new initiative to send people to Mars by 2030 .

Hawking, Obama and other proponents of long-term space travel are making a grave error. Humans cannot leave Earth for the several years that it takes to travel to Mars and back, for the simple reason that our biology is intimately connected to Earth.

To function properly, we need gravity. Without it, the environment is less demanding on the human body in several ways, and this shows upon the return to Earth. Remember the sight of weakened astronauts emerging after the Apollo missions? That is as nothing compared with what would happen to astronauts returning from Mars.

One of the first things to be affected is the heart, which shrinks by as much as a quarter after just one week in orbit ( The New England Journal of Medicine , vol 358, p 1370 ). Heart atrophy leads to decreases in blood pressure and the amount of blood pushed out by the heart. In this way heart atrophy leads to reduced exercise capacity. Astronauts returning to Earth after several months in the International Space Station experience dizziness and blackouts because blood does not reach their brains in sufficient quantities.

Six weeks in bed leads to about as much atrophy of the heart as one week in space, suggesting that the atrophy is caused by both weightlessness and the concomitant reduction in exercise.

Other muscle tissue suffers too. The effects of weightlessness on the muscles of the limbs are easy to verify experimentally. Because they bear the body’s weight, the “anti-gravity” muscles of the thighs and calves degenerate significantly when they are made redundant during space flight.

Despite the best attempts to give replacement exercise to crew members on the International Space Station, after six months they had still lost 13 per cent of their calf muscle volume and 32 per cent of the maximum power that their leg muscles could deliver ( Journal of Applied Physiology , vol 106, p 1159 ).

Various metabolic changes also occur, including a decreased capacity for fat oxidation, which can lead to the build-up of fat in atrophied muscle. Space travellers also suffer deterioration of immune function both during and after their missions ( Aviation, Space, and Environmental Medicine , vol 79, p 835 ).

Arguably the most fearsome effect on bodies is bone loss ( The Lancet , vol 355, p 1569 ). Although the hardness and strength of bone, and the relative ease with which it fossilises, give it an appearance of permanence, bone is actually a living and remarkably flexible tissue. In the late 19th century, the German anatomist Julius Wolff discovered that bones adjust to the loads that they are placed under. A decrease in load leads to the loss of bone material, while an increase leads to thicker bone.

It is no surprise, then, that in the microgravity of space bones demineralise, especially those which normally bear the greatest load. Cosmonauts who spent half a year in space lost up to a quarter of the material in their shin bones, despite intensive exercise ( The Lancet , vol 355, p 1607 ). Although experiments on chicken embryos on the International Space Station have established that bone formation does continue in microgravity, formation rates are overtaken by bone loss.

What is of greatest concern here is that, unlike muscle loss which levels off with time, bone loss seems to continue at a steady rate of 1 to 2 per cent for every month of weightlessness. During a three-year mission to Mars, space travellers could lose around 50 per cent of their bone material, which would make it extremely difficult to return to Earth and its gravitational forces. Bone loss during space travel certainly brings home the maxim “use it or lose it”.

“Losing 50 per cent of bone material would make it extremely difficult to return to Earth’s gravity”

Bone loss is not permanent. Within six months of their return to Earth, those cosmonauts who spent half a year in space did show partial recovery of bone mass. However, even after a year of recovery, men who had been experimentally exposed to three months of total bed rest had not fully regained all the lost bone, though their calf muscles had recovered much earlier ( Bone , vol 44, p 214 ).

Space agencies will have to become very creative in addressing the issue of bone loss during flights to Mars. There are concepts in development for spacecraft with artificial gravity, but nobody even knows what gravitational force is needed to avoid the problems. So far, boneless creatures such as jellyfish are much more likely than people to be able to return safely to Earth after multi-year space trips. For humans, gravity is a Mars bar.

The impossibility of an escape to space is just one of many examples of how our bodies, and those of our fellow organisms, are inseparable from the environments in which we live. In our futuristic ambitions we should not forget that our minds and bodies are connected to Earth as by an umbilical cord.

Sign up to our weekly newsletter

Receive a weekly dose of discovery in your inbox! We'll also keep you up to date with New Scientist events and special offers.

More from New Scientist

Explore the latest news, articles and features

Why falling birth rates will be a bigger problem than overpopulation

Subscriber-only

Extinct freshwater dolphin from the Amazon was largest of all time

Californian orcas used specialised tactics for hunting whale calves, tom gauld on the masked botanist, popular articles.

Trending New Scientist articles

History of Space Travel

Learn about the history of humans traveling into space.

The first earthling to orbit our planet was just two years old, plucked from the streets of Moscow barely more than a week before her historic launch. Her name was Laika. She was a terrier mutt and by all accounts a good dog. Her 1957 flight paved the way for space exploration back when scientists didn’t know if spaceflight was lethal for living things.

Humans are explorers. Since before the dawn of civilization, we’ve been lured over the horizon to find food or more space, to make a profit, or just to see what’s beyond those trees or mountains or oceans. Our ability to explore reached new heights—literally—in the last hundred years. Airplanes shortened distances, simplified travel, and showed us Earth from a new perspective. By the middle of the last century, we aimed even higher.

Our first steps into space began as a race between the United States and the former Soviet Union, rivals in a global struggle for power. Laika was followed into orbit four years later by the first human, Soviet Cosmonaut Yuri A. Gagarin. With Earth orbit achieved, we turned our sights on the moon. The United States landed two astronauts on its stark surface in 1969, and five more manned missions followed. The U.S.’s National Aeronautics and Space Administration (NASA) launched probes to study the solar system. Manned space stations began glittering in the sky. NASA developed reusable spacecraft—space shuttle orbiters—to ferry astronauts and satellites to orbit. Space-travel technology had advanced light-years in just three decades. Gagarin had to parachute from his spaceship after reentry from orbit. The space shuttle leaves orbit at 16,465 miles an hour (26,498 kilometers an hour) and glides to a stop on a runway without using an engine.

Space travel is nothing like in the movies. Getting from A to B requires complex calculations involving inertia and gravity—literally, rocket science—to "slingshot" from planet to planet (or moon) across the solar system. The Voyager mission of the 1970s took advantage of a rare alignment of Jupiter, Saturn, Uranus, and Neptune to shave off nearly 20 years of travel time. Space is also dangerous. More than 20 astronauts have died doing their job.

That hasn’t stopped people from signing up and blasting off. NASA’s shuttle program has ended, but private companies are readying their own space programs. A company called Planetary Resources plans to send robot astronauts to the Asteroid Belt to mine for precious metals. Another company named SpaceX is hoping to land civilian astronauts on Mars—the next human step into the solar system—in 20 years. NASA and other civilian companies are planning their own Mars missions. Maybe you’ll be a member of one? Don’t forget to bring your dog.

Space videos

Outer this world, planet earth, calling all earthlings, the milky way, shoot for the stars, what is hubble, how hubble works, read this next, total solar eclipse.

  • African American Heroes

Katherine Johnson

  • Action and Adventure

Space Explorer

  • Terms of Use
  • Privacy Policy
  • Your California Privacy Rights
  • Children's Online Privacy Policy
  • Interest-Based Ads
  • About Nielsen Measurement
  • Do Not Sell My Info
  • National Geographic
  • National Geographic Education
  • Shop Nat Geo
  • Customer Service
  • Manage Your Subscription

Copyright © 1996-2015 National Geographic Society Copyright © 2015-2024 National Geographic Partners, LLC. All rights reserved

Featured Topics

Featured series.

A series of random questions answered by Harvard experts.

Explore the Gazette

Read the latest.

An overheated planet Earth.

‘Harvard Thinking’: Climate alignment is no easy task

Stokes looking off into the distance.

A playbook for policy change

Chris Laumann and Norman Yao explain high-pressure hydride superconductor research.

Under pressure

How to prepare for a trip to space.

Illustration by Oliver Burston/Ikon Images

Astronauts spend years training for missions. How do commercial travelers get ready?

Part of the wondering series.

The Medical School’s Aleksandra Stankovic is an aerospace psychologist and spaceflight biomedical researcher who studies how to optimize human performance and behavioral health in extreme operational environments. We asked her how a person gets ready to travel to space.

The spaceflight environment presents many challenges — technical, physical, and psychological. With more people having access to space travel today than ever before, successful and safe spaceflights require varying levels of preparation before launch day.

For government astronauts, candidates undergo a rigorous two-year initial training period before qualifying for flight assignment. This training includes learning about Space Station and flight vehicle systems, studying orbital mechanics, becoming proficient in emergency procedures (like how to handle scenarios such as fire, cabin depressurization, or medical issues), conducting flight training in T-38 jets (to build quick decision-making skills in high-performance aircraft), and developing Russian language skills (since international space missions involve collaboration among astronauts from various countries).

To prepare for the microgravity environment of space, astronauts also participate in simulations of weightlessness, including parabolic flights and training in the Neutral Buoyancy Lab, a large swimming pool where astronauts practice conducting spacewalks and learn to perform tasks in their pressurized spacesuits. Astronauts complete survival training and learn to cope with extreme conditions — a crucial skill in case of an emergency landing back on Earth in the water or in very cold locations like Siberia. They are trained to operate the robotic arm that is used for tasks such as capturing cargo spacecraft.

Once they receive a flight assignment, astronauts complete an additional 18 months of mission-specific training. They simulate various mission scenarios — including launch, rendezvous, and docking — and emergency procedures. Additionally, they undergo extensive training on the scientific experiments they’ll be conducting, like how to work with equipment, collect samples, and handle data.

Anyone who spends prolonged periods in space will need to spend a lot of their day working out to keep their bodies in strong shape to be healthy when they return home.

Since maintaining physical fitness is vital for astronauts to counteract the muscle and bone loss experienced in microgravity, they spend a lot of time preflight working out. At the same time, long-duration space missions can be mentally challenging, given the prolonged isolation, confinement, and separation from family and friends. Astronauts learn strategies to manage stress, maintain psychological well-being, and work effectively in close environments with their fellow crewmembers.

Commercial astronaut training is significantly less intensive than the training government-sponsored astronauts receive, since their missions are often of shorter duration and focus more on providing safe and enjoyable flying experiences. While commercial crews may stay in space for shorter intervals ranging from a few minutes for suborbital flight to several days or even weeks on the Space Station, government astronauts typically spend six months or more on the station. (Astronaut Frank Rubio recently set the record for longest American space mission with 371 consecutive days in space; cosmonaut Valeri Polyakov, who logged 437 continuous days in orbit on Russia’s Mir space station between 1994 and 1995, still holds the world record.)

Commercial astronauts often receive more generalized training that covers the basics of space travel and safety/emergency procedures. Anyone who spends prolonged periods in space will need to spend a lot of their day working out to keep their bodies in strong shape to be healthy when they return home. Everyday activities can be challenging without gravity, and sleeping can be difficult without the normal light cues from the sun that our bodies rely upon on Earth to regulate our circadian rhythms. A combination of technology and training help space travelers adapt.

As more people travel to space, on an expanding range of flight vehicles and for varying types of missions, spaceflight preparation too will undoubtedly continue to evolve. It’s an exciting time to be studying how to keep humans safe and healthy in space, and researchers like me are thrilled to be a part of enabling this next great wave of human space exploration!

— As told to Anna Lamb/Harvard Staff Writer

Share this article

Also in this series:.

A person walking a dog, a person riding a bike, a person lifting a weight in each hand, a person running, and a person using a pool lift.

The 20-minute workout

Pressed for time? You still have plenty of options.

Illustration of doctor studying X-rays. (Stuart Kinlough / Ikon Images)

How to deliver very bad news

It’s hard to be a doctor. This is when it’s really hard.

Produce line supermarket shelves.

Is organic better?

Not if you follow the evidence, researcher says

Two people arguing. (Illustration by Oscar Armelles / Ikon Images)

Next spat with your partner, try silence

If you’re doing all the talking, then you’re probably doing it wrong, says negotiation expert.

Bright colorful watercolor collage by Louise Rösler called

How to judge a painting

Do: Ask questions and keep an open mind. Don’t: Say your child could’ve made that.

Two hands holding attracting magnets.

Can you be close without sex?

Healthy intimate relationships vary but share one key feature, says psychologist

Striped pencil twisted in knot.

How to write funny

For Cora Frazier, it usually starts with deep sadness

Collage of people walking and heart health.

Faster, fitter?

Not really, says Spaulding Rehab expert. When you go for a walk, focus on this instead.

Black hole.

Nothing that is not there and the nothing that is

You’ll never experience a black hole, but Avi Loeb can help you imagine one

Cyclist in bike lane.

Is cycling safe?

We shouldn’t take no for an answer, researcher says

space travel is

The language of dreams

Proficiency, place, emotion, or something else? These late-night conversations defy easy explanation.

Two emoji characters, one smiling, one envious.

What’s a little envy between friends?

The feeling can eat you alive — but only if you let it

You might like

On ‘Harvard Thinking,’ experts at the Salata Institute outline tensions between global and local priorities

Stokes looking off into the distance.

Leah Stokes turns a love for the wilderness into a commitment to help mitigate climate change

Chris Laumann and Norman Yao explain high-pressure hydride superconductor research.

New tool for precise measurement of superconductors

So what exactly makes Taylor Swift so great?

Experts weigh in on pop superstar's cultural and financial impact as her tours and albums continue to break records.

Do phones belong in schools?

Banning cellphones may help protect classroom focus, but school districts need to stay mindful of students’ sense of connection, experts say.

March 18, 2024

The Great Debate: Could We Ever Travel through Time?

Our space and physics editors go head-to-head over a classic mind-bending question.

By Clara Moskowitz & Lee Billings

cemagraphics/Getty Images

Science, Quickly

Clara Moskowitz: Hi, I’m Clara Moskowitz, a space editor here at Scientific American. We’re taking a break this week to look back at some of our favorite podcast episodes. I chose this one about the physics of time travel, because I’m a big sci-fi geek, so I’m fascinated by the topic. But also, it was such a fun debate to have with my colleague and friend, Lee Billings, another space editor here. We each picked a side – I was pro time travel, he was con—and dug our heels in. Check it out!

[Clip: Show theme music]

Moskowitz: We’re here today to talk about time travel. A perennial – dare I say, timeless–topic of science fiction, but is it possible? Is there any chance at all that it could actually happen?

On supporting science journalism

If you're enjoying this article, consider supporting our award-winning journalism by subscribing . By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today.

Lee Billings: No. No, no no no no. (laughs). Well, kinda. Not really. ARGH. I’m Lee Billings.

Moskowitz: I’m Clara Moskowitz, and this is Cosmos, Quickly , the biweekly space podcast from Scientific American . 

Moskowitz: We’re going to have a little friendly debate.

Billings: Really? I came for a throwdown.

Moskowitz: Well, a wrangle. A parley. A confab. Lee, what do you have against time travel?

Billings: So I love the idea of time travel! And in fact I do it all the time—like most everyone else I’m traveling into the future at one second per second. I’m less of a fan, though, of more speculative time travel, which is good fodder for goofy sci-fi stories, but in the real world it’s an implausible distraction.

Moskowitz: But really, we can stay within plausible physics and still see how more extreme versions of time travel are possible. See, Einstein’s special theory of relativity shows that the rate time flows at depends on how fast you’re moving. 

Billings: Einstein strikes again, what a rascal.

Moskowitz: If you’re traveling in a starship at close to the speed of light, you’ll still experience the familiar one-second-per-second ticking of a clock– but an observer back on Earth would see your clock moving glacially slow. To them, you’d be moving through time at a snail’s pace. That means that when you finally got back,  maybe only a year would have passed for you, but a century could have gone by for your friends on Earth. Ergo, you just traveled to the future! 

Billings: Right, right, no one’s disputing any of that! We can even measure this sort of “time dilation” right now on Earth, not with starships, but with subatomic particles. Some of those particles have very short lifetimes, decaying almost instantaneously. But if we drastically speed them up, like in a particle accelerator, we find they endure longer in proportion to how fast they’re going. So riddle me this, though, Clara: How can we travel into the past? That’s something so hard to do–effectively impossible, almost–that it’s scarcely worth thinking about.

[Clip: Back to the Future : “This is what makes time travel possible. The flux capacitor!”]

Moskowitz: I get it—no one has yet conceived of a way to journey to the past. But the crazy thing is it’s not impossible. Time is one of the four dimensions in the universe, along with three dimensions of space. And we move through space in all directions just fine, and according to physics, travel through time should be just as possible.

One way that people have looked into is via a wormhole—a shortcut bridge through spacetime that was predicted by general relativity. Wormholes can connect distant points in spacetime, meaning you could conceivably use one to bridge not just the gap between here and a distant galaxy, but the span between 2023 and 1923. 

[CLIP: Interstellar : “That’s the wormhole.”]

Billings : Ah yes, wormholes—the last refuge of scoundrels and desperate physicists. The trouble with wormholes Clara, is that, unlike a DeLorean, we have no evidence they actually exist—and, even if they did, it seems the only ways to make them traversable and stable involves using negative energy or negative mass  to prop them open. And, guess what, just like wormholes themselves, we have no evidence these weird forms of matter and energy actually exist, either. And let’s just beat this dead horse one more time—even if wormholes exist, as well as the means to make them traversable, to go back in time seems to require anchoring one end in a region of very warped spacetime, like around a black hole, or accelerating it to nearly lightspeed. Are you sensing a theme here, Clara?

Moskowitz: Yeah, yeah. All I can say is that just because there’s no evidence any of these things exist, there’s also no evidence they don’t or can’t exist. Wormholes are real solutions to the equations of general relativity, and even negative energy and mass are concepts that come up in the math and aren’t prohibited.

Billings: Well how about some more practical arguments, then? If time travel were possible, wouldn’t we have met some time travelers by now? Wouldn’t someone have gone back and killed Hitler—or at least prevented me from wearing that ridiculous outfit to my high school prom? You know there’s a famous story about physicist Stephen Hawking, who invited time travelers to come to a party he was holding. The trick was the the party happened in 2009, but the invitation came out in a miniseries that was broadcast in 2010—thus, only time travelers would have been able to attend. 

[CLIP: Stephen Hawking Time Travel Party: “Here is the invitation, giving the exact coordinates in time and space. I am hoping in one form or another it will survive for many thousands of years.”]

Billings: Sadly, the hors d'oeuvres went uneaten and the champagne sat unopened, because, clearly, time travel to the past is impossible! 

Moskowitz: I admit a party with Stephen Hawking should have been pretty alluring to time travelers, if they were out there. But you’re forgetting about the International Clause of Secrecy that all time travelers probably have to swear to, making sure to hide their identities and abilities from those in earlier eras.  

Billings: Hmm, yes the clause of secrecy here. Feels like we’re really veering into science fiction territory special pleading here. And don’t forget all the paradoxes that we have to worry about too. There are lots of good reasons to think time travel might introduce insurmountable paradoxes in physics. The most famous being the grandfather—or grandmother—paradox. If time travel were possible into the past, so the thinking goes, then a person could go back in time and kill their own grandparents, thus making it impossible for them to be born and impossible for them to travel back in time to ever commit the murder, and so on and so on.

Moskowitz: I wonder if it could be like a many-worlds scenario, where each change a time traveler makes to the past spawns a whole new universe that carries on from that point. So if I went back in time and killed one of my forebears, then a new branch universe would begin where that whole line of descendents, including me, never existed. I mean, it sounds crazy, but then again, physics is pretty enamored with multiverses, and they seem to pop up for lots of reasons already. Maybe it’s not impossible? 

Billings: If not impossible, then I’d say, implausible.

Moskowitz: Well, I’m forever an optimist, Lee! Thanks for listening to the Cosmos, Quickly .

Billings: Our show is produced by Jeff DelViscio, Tulika Bose and Kelso Harper.  Our music was composed by Dominic Smith.

Moskowtiz: If you like the show, please consider rating or leaving a review. You can also email feedback, questions, and tips to [email protected]

Billings: For more spacetime hijinks and all your science news, head to SciAm.com. This has been Cosmos, Quickly . I’m Lee Billings. 

Moskowitz: I’m Clara Moskowitz. 

Billings: And we’ll see you next time, in the future!

space travel is

  • Share full article

Advertisement

Supported by

Voyager 1, First Craft in Interstellar Space, May Have Gone Dark

The 46-year-old probe, which flew by Jupiter and Saturn in its youth and inspired earthlings with images of the planet as a “Pale Blue Dot,” hasn’t sent usable data from interstellar space in months.

space travel is

By Orlando Mayorquin

When Voyager 1 launched in 1977, scientists hoped it could do what it was built to do and take up-close images of Jupiter and Saturn. It did that — and much more.

Voyager 1 discovered active volcanoes, moons and planetary rings, proving along the way that Earth and all of humanity could be squished into a single pixel in a photograph, a “ pale blue dot, ” as the astronomer Carl Sagan called it. It stretched a four-year mission into the present day, embarking on the deepest journey ever into space.

Now, it may have bid its final farewell to that faraway dot.

Voyager 1 , the farthest man-made object in space, hasn’t sent coherent data to Earth since November. NASA has been trying to diagnose what the Voyager mission’s project manager, Suzanne Dodd, called the “most serious issue” the robotic probe has faced since she took the job in 2010.

The spacecraft encountered a glitch in one of its computers that has eliminated its ability to send engineering and science data back to Earth.

The loss of Voyager 1 would cap decades of scientific breakthroughs and signal the beginning of the end for a mission that has given shape to humanity’s most distant ambition and inspired generations to look to the skies.

“Scientifically, it’s a big loss,” Ms. Dodd said. “I think — emotionally — it’s maybe even a bigger loss.”

Voyager 1 is one half of the Voyager mission. It has a twin spacecraft, Voyager 2.

Launched in 1977, they were primarily built for a four-year trip to Jupiter and Saturn , expanding on earlier flybys by the Pioneer 10 and 11 probes.

The Voyager mission capitalized on a rare alignment of the outer planets — once every 175 years — allowing the probes to visit all four.

Using the gravity of each planet, the Voyager spacecraft could swing onto the next, according to NASA .

The mission to Jupiter and Saturn was a success.

The 1980s flybys yielded several new discoveries, including new insights about the so-called great red spot on Jupiter, the rings around Saturn and the many moons of each planet.

Voyager 2 also explored Uranus and Neptune , becoming in 1989 the only spacecraft to explore all four outer planets.

space travel is

Voyager 1, meanwhile, had set a course for deep space, using its camera to photograph the planets it was leaving behind along the way. Voyager 2 would later begin its own trek into deep space.

“Anybody who is interested in space is interested in the things Voyager discovered about the outer planets and their moons,” said Kate Howells, the public education specialist at the Planetary Society, an organization co-founded by Dr. Sagan to promote space exploration.

“But I think the pale blue dot was one of those things that was sort of more poetic and touching,” she added.

On Valentine’s Day 1990, Voyager 1, darting 3.7 billion miles away from the sun toward the outer reaches of the solar system, turned around and snapped a photo of Earth that Dr. Sagan and others understood to be a humbling self-portrait of humanity.

“It’s known the world over, and it does connect humanity to the stars,” Ms. Dodd said of the mission.

She added: “I’ve had many, many many people come up to me and say: ‘Wow, I love Voyager. It’s what got me excited about space. It’s what got me thinking about our place here on Earth and what that means.’”

Ms. Howells, 35, counts herself among those people.

About 10 years ago, to celebrate the beginning of her space career, Ms. Howells spent her first paycheck from the Planetary Society to get a Voyager tattoo.

Though spacecraft “all kind of look the same,” she said, more people recognize the tattoo than she anticipated.

“I think that speaks to how famous Voyager is,” she said.

The Voyagers made their mark on popular culture , inspiring a highly intelligent “Voyager 6” in “Star Trek: The Motion Picture” and references on “The X Files” and “The West Wing.”

Even as more advanced probes were launched from Earth, Voyager 1 continued to reliably enrich our understanding of space.

In 2012, it became the first man-made object to exit the heliosphere, the space around the solar system directly influenced by the sun. There is a technical debate among scientists around whether Voyager 1 has actually left the solar system, but, nonetheless, it became interstellar — traversing the space between stars.

That charted a new path for heliophysics, which looks at how the sun influences the space around it. In 2018, Voyager 2 followed its twin between the stars.

Before Voyager 1, scientific data on the sun’s gases and material came only from within the heliosphere’s confines, according to Dr. Jamie Rankin, Voyager’s deputy project scientist.

“And so now we can for the first time kind of connect the inside-out view from the outside-in,” Dr. Rankin said, “That’s a big part of it,” she added. “But the other half is simply that a lot of this material can’t be measured any other way than sending a spacecraft out there.”

Voyager 1 and 2 are the only such spacecraft. Before it went offline, Voyager 1 had been studying an anomalous disturbance in the magnetic field and plasma particles in interstellar space.

“Nothing else is getting launched to go out there,” Ms. Dodd said. “So that’s why we’re spending the time and being careful about trying to recover this spacecraft — because the science is so valuable.”

But recovery means getting under the hood of an aging spacecraft more than 15 billion miles away, equipped with the technology of yesteryear. It takes 45 hours to exchange information with the craft.

It has been repeated over the years that a smartphone has hundreds of thousands of times Voyager 1’s memory — and that the radio transmitter emits as many watts as a refrigerator lightbulb.

“There was one analogy given that is it’s like trying to figure out where your cursor is on your laptop screen when your laptop screen doesn’t work,” Ms. Dodd said.

Her team is still holding out hope, she said, especially as the tantalizing 50th launch anniversary in 2027 approaches. Voyager 1 has survived glitches before, though none as serious.

Voyager 2 is still operational, but aging. It has faced its own technical difficulties too.

NASA had already estimated that the nuclear-powered generators of both spacecrafts would likely die around 2025.

Even if the Voyager interstellar mission is near its end, the voyage still has far to go.

Voyager 1 and its twin, each 40,000 years away from the next closest star, will arguably remain on an indefinite mission.

“If Voyager should sometime in its distant future encounter beings from some other civilization in space, it bears a message,” Dr. Sagan said in a 1980 interview .

Each spacecraft carries a gold-plated phonograph record loaded with an array of sound recordings and images representing humanity’s richness, its diverse cultures and life on Earth.

“A gift across the cosmic ocean from one island of civilization to another,” Dr. Sagan said.

Orlando Mayorquin is a general assignment and breaking news reporter based in New York. More about Orlando Mayorquin

What’s Up in Space and Astronomy

Keep track of things going on in our solar system and all around the universe..

Never miss an eclipse, a meteor shower, a rocket launch or any other 2024 event  that’s out of this world with  our space and astronomy calendar .

A nova named T Coronae Borealis lit up the night about 80 years ago. Astronomers say it’s expected to put on another show  in the coming months.

Voyager 1, the 46-year-old first craft in interstellar space which flew by Jupiter and Saturn in its youth, may have gone dark .

Two spacecraft have ended up askew on the moon this year, illustrating that it’s not so easy to land upright on the lunar surface. Here is why .

What do you call a galaxy without stars? In addition to dark matter and dark energy, we now have dark galaxies  — collections of stars so sparse and faint that they are all but invisible.

Is Pluto a planet? And what is a planet, anyway? Test your knowledge here .

  • Search Please fill out this field.
  • Manage Your Subscription
  • Give a Gift Subscription
  • Sweepstakes
  • Space Travel + Astronomy

Space Tourism Is Here: Booking a Trip to the Final Frontier

The next era of space exploration and innovation is here — and we're all invited. A billionaire space race is underway as Blue Origin, Virgin Galactic, SpaceX, and others are testing the technology to take us to places previously visited only by highly trained astronauts. Space tourism is officially taking flight, and it might just save the Earth.

space travel is

In July 2021, we watched as Richard Branson and Jeff Bezos took to the skies in a giant leap for the space tourism industry, but their launches to the edge of space weren't timed particularly well. Against the backdrop of a global pandemic and climate emergency, two billionaires taking joy rides to space may not have been good optics, but don't underestimate what just happened — and how important it could be for the future of humanity.

With the first crewed launches of Virgin Galactic's supersonic space plane and Blue Origin's reusable rocket, a world of commercial space travel is taking its first step. Both companies plan to begin regular, scheduled trips for paying space tourists in the near future, but their visions stretch back many years to the beginning of human spaceflight.

The Space Race: Then and Now

Bezos's Blue Origin chose an auspicious day to send its first crew to space. July 20, 2021 was exactly 52 years after Apollo 11 astronauts Neil Armstrong and Buzz Aldrin became the first humans to walk on the moon. But that wasn't the only major space travel anniversary celebrated in 2021.

April 12 was the 60th anniversary of Russian cosmonaut Yuri Gagarin becoming the first human to not only reach space, but also go into orbit around Earth. Meanwhile, May 5 saw the 60th anniversary of NASA's Freedom 7 mission, which launched Alan Shepard on a suborbital flight that lasted 15 minutes. He reached an altitude of 101 miles to become the first American in space before his capsule parachuted to splashdown in the ocean.

The name of Blue Origin's New Shepard launch system is no coincidence. Its mission profile is almost identical to America's inaugural 1961 spaceflight, save for billionaire-grade comfy seats and large windows. From Launch Site One near Van Horn in the West Texas desert, that rocket fires a capsule containing up to six people (but no pilot) into space, which then parachutes down 15 minutes later.

The Virgin Galactic experience is different. Its supersonic rocket-powered spaceplane SpaceShipTwo VSS Unity seats six passengers and two highly trained pilots. It takes off on a runway from Spaceport America near Truth or Consequences, New Mexico, while strapped to a mothership. At 52,000 feet, it detaches and burns its rocket engine for one minute to reach Mach 3 speeds and touch the edge of space. After a few minutes of weightlessness (and a chance for passengers to see the curvature of Earth against the blackness of space), it glides back to land on a runway.

The Price for a Ticket to Space

These short trips are anticipated to cost between $250,000 and $500,000, but in January 2022, expect to see a truly out-of-this-world private trip to space with an even more astronomical price tag. It will come from the other, arguably much more important billionaire in the space tourism bubble: Elon Musk. Axiom Mission 1 will see his company, SpaceX, launch four private astronauts on behalf of Houston-based space tourism company Axiom Space. An American real estate investor, a Canadian investor, a former Israeli Air Force pilot, and an ex-Space Shuttle pilot will launch on an incredible orbital mission in its Crew Dragon spacecraft.

At $55 million per ticket, this is ultra-aspirational space tourism of the highest order. "The experience is drastically different because they will be launching on a SpaceX rocket and going to the International Space Station (ISS) for 10 days," says Christina Korp, cofounder of Space for a Better World . "They will be doing what real astronauts do, and I don't think it's an accident that Virgin Galactic and Blue Origin did their flights before Axiom's mission." Axiom Space intends to launch a private space station — the first "space hotel" — as early as 2024 to give space tourists somewhere to visit.

The Future of Space Tourism — and of Our Planet

Musk talks of Mars colonies and humanity spreading out into the cosmos, but since 2012, SpaceX has made a lot of money from NASA contracts to launch supplies to the ISS. In the summer of 2020, it began ferrying NASA astronauts there, too. SpaceX's Starship — currently being tested — will land two NASA astronauts, the first woman and the next man, on the moon in 2024.

You see, space tourism is just a sideshow to a bigger and more worthy goal of saving the planet. Next year, Blue Origin plans to test its reusable New Glenn rocket — named after John Glenn, the first American to orbit the Earth in 1962 — which will be able to take cargo and astronauts into orbit. Bezos has said he thinks we need to go to space to save Earth, specifically by protecting the planet from pollution by moving heavy industry into space. That can only happen when space travel is safe, scheduled, and affordable. Space tourism will help create a competitive space economy, just as mass tourism has lowered the cost of flying.

Similarly, Branson's aim is to increase access to space. "We are at the vanguard of a new space age…Our mission is to make space more accessible to all," he said after his inaugural flight. A microgravity experiment was on board that first flight on July 11, with similar plans for all subsequent trips. Meanwhile, sister company Virgin Orbit's LauncherOne sends small satellites and science payloads into orbit via a small rocket launch from underneath the wing of a Boeing 747.

The scientific spin-offs for all of us down on Earth are currently unknown, but the space community has an incredible track record when it comes to innovation. "Clean energy as solar power is from the space program," says Korp. "Solar panels were invented to power satellites and refined to power spacecraft." Cue GPS, weather forecasting, telecommunications, and even internet access. There are also fleets of satellites large and small that observe how our planet is behaving and changing. "It's the space industry that's monitoring climate change, tracking hurricanes, and learning how to survive in the extreme environment of space — including experiments to grow food with almost no water, for example," says Korp. Every single space mission, including suborbital and even zero-gravity flights, have environmental experiments on board as default.

"This is not about escaping Earth," said Bezos after the flight. "The whole point is, this is the only good planet in the solar system and we have to take care of it." Bezos wants to scale up into affordable space travel. That will enable long-term, commercial projects that ultimately may help prevent further climate change, or at least help us cope with its consequences.

However, Blue Origin, Virgin Galactic, and SpaceX won't be the only way to reach space. Russian space agency Roscosmos is expected to take "citizen space explorers" to the ISS soon, but the most affordable way to get "black sky time" may be with Space Perspective , which will launch a pressurized capsule propelled by a high-performance space balloon.

The six-hour flight will cost around $125,000 per person and launch from Space Coast Spaceport in Florida in 2024. "Unlike short-lived, adrenaline-fueled moments of weightlessness, Space Perspective flights bring you space calm," says Jane Poynter, founder, co-CEO, and CXO of Space Perspective. The flights on Spaceship Neptune involve a gentle ascent at just 12 miles per hour for a six-hour tour of Earth's biosphere, culminating in a view of our beautiful planet from space.

Space tourism is here at last. Instagram had better get ready for "Earth selfies."

Program Credits

Editorial Lead: Elizabeth Rhodes Contributors: Jamie Carter and Stefanie Waldek Visuals Editor: Mariah Tyler Art Director: Jenna Brillhart Designer: Sarah Maiden

You Won’t Hear Much About the Next Chapter of Space Travel

Space tourism is getting less transparent, and more like traveling by private jet.

A passenger floats in weightlessness on a Virgin Galactic flight to the edge of space

Listen to this article

Listen to more stories on hark

Of all the high-flying tourism ventures spawned by space-obsessed billionaires, Virgin Galactic, founded by Richard Branson, offers perhaps the most unconventional approach. It doesn’t use big rockets or gumdrop-shaped capsules. Instead, an airplane takes off with a spacecraft strapped to its wing. The spacecraft, shaped like a plane itself, holds the paying customers and more pilots. When the airplane reaches a certain altitude, it releases the spacecraft. The spacecraft’s pilots then ignite its engine, and the vehicle soars straight up, to the fuzzy boundary that separates us from the rest of the universe, before gliding back down and landing on a runway.

The spaceplane experience is a stark contrast to Blue Origin’s suborbital jaunts and SpaceX’s orbital missions, but Virgin Galactic’s passengers still have a few surreal minutes of weightlessness, and they get to see the planet gleaming against the darkness of space. Those passengers have included the first former Olympian to reach space, as well as the first mother-daughter duo and, most recently, the first Pakistani .

In the midst of all that, Virgin Galactic clocked a first that raised some eyebrows: The company withheld the passenger list from the public before a takeoff last month, divulging the travelers’ names only after they had landed. The company never publicly explained its preflight secrecy. (Virgin Galactic did not respond to a request for comment.) Yesterday, Virgin Galactic announced its next flight, scheduled for November; the company kept one of the three listed passengers anonymous, saying only that the person is “of Franco-Italian nationality.”

Virgin is of course within its rights to withhold passenger names before takeoff. After all, airlines and railroads keep private the names of their customers. But Virgin Galactic’s choice to do so marks a subtle shift—the latest in U.S. spaceflight’s arc from a publicly funded national mission to private tourism. NASA, as a taxpayer-funded organization, has always had to provide the public with launch lists and livestreams. But the age of space tourism raises a host of questions: How much openness do space-tourism companies owe the public? How much privacy do they owe their customers? Before the Virgin flight returned home last month, it operated almost like a privately chartered plane, its movements known to relevant aviation agencies but its passengers’ names undisclosed to the public. Commercial spaceflight and air travel are still far from alike, but in this particular aspect, the space-tourism industry may be drifting toward its private-jet era.

Read: The new ‘right stuff’ is money and luck

In practice, the space-tourism industry is barely more than two years old, and it’s “still finding its norms,” says Carissa Christensen, a space consultant and the CEO of BryceTech, an analytics and engineering firm. The first passenger rosters were marquee news in 2021, when Branson and Jeff Bezos were racing to be the first to ride their own spacecraft , and Elon Musk’s SpaceX was working to send a quartet of private astronauts with zero spaceflight experience into orbit.

All three of their companies publicized, and even hyped, the passenger lists, in some cases months in advance. Wally Funk, an octogenarian aviator who had outperformed male candidates in astronaut tests during the 1960s but was kept out of the astronaut corps because she was a woman, flew alongside Bezos . Jared Isaacman, a billionaire businessman, paid for three other people to fly into orbit with him on SpaceX; all of them gave countless interviews before launch. And who can forget the hype ahead of William Shatner’s flight, and the Star Trek star’s unfiltered, emotional remarks after landing?

The rosters became less noteworthy as time went on: The customers were no longer memorable guests who got free rides, but simply very wealthy people who could afford the trips on their own. Last month’s temporarily secret Virgin Galactic fliers included a real-estate investor from Las Vegas, a South African entrepreneur, and a British engineer who founded a company that builds race cars. Michelle Hanlon, a space lawyer and the executive director of the University of Mississippi’s Center for Air and Space Law, told me that she was mildly surprised by Virgin Galactic’s decision to withhold the passengers’ identities before takeoff, but that the decision did not strike her as inappropriate.

“From a paparazzi standpoint, if it’s Ashton Kutcher, the world’s gonna care a little bit more than if it’s Michelle Hanlon,” Hanlon said. (Kutcher did, in fact, purchase a Virgin Galactic ticket in 2012, but he later sold it back to the company after his wife and fellow actor, Mila Kunis, talked him out of going.) And from a legal standpoint, nothing inappropriate occurred, Hanlon said; there are no existing requirements for a private company to disclose passenger names. Space travelers must sign waivers from the Federal Aviation Administration outlining the risks associated with the activity, she said, but the companies they’re flying with are not required to provide the agency with a passenger list.

Read: Jeff Bezos knows who paid for him to go to space

Passenger names aren’t the only details of commercial spaceflight that are becoming more opaque. When SpaceX launched its first set of private astronauts, the company shared significantly less live footage of their experience in orbit than they did when NASA astronauts test-drove the capsule a year earlier. During its last two flights, Virgin Galactic decided not to provide a livestream, giving updates on social media instead.

Because there are no regulations, it’s difficult to say when the companies’ right to privacy becomes a concerning level of secrecy. NASA overshares when it comes to its astronauts and their mission, because the public—which funds the agency—expects it. Americans might also expect a good look at SpaceX customers who visit the International Space Station, which relies on billions of dollars of taxpayer money, and where private visitors share meals with government astronauts. But what about other kinds of SpaceX missions, which go into orbit without disembarking at any government-owned facility? The company developed its crewed launch services with significant investment from NASA, so virtually every SpaceX trip indirectly involves government money. That doesn’t necessarily mean SpaceX is obligated to share as the space agency does, even if people on the ground feel that it should.

Another major difference between NASA missions and private ones, of course, is that astronauts are at work, whereas many space tourists are presumably just having fun. Caryn Schenewerk, a consultant who specializes in commercial spaceflight at her firm CS Consulting, told me that she thinks commercial spaceflight will adopt the practices of other forms of adventure tourism. Take skydiving, for example: Schenewerk said that she has signed paperwork granting the skydiving company permission to use footage of her experience for its own purposes. “There’s some expectation of privacy on the individual’s behalf that then has to be actively waived for the company’s benefit,” she said.

The once-anonymous Virgin Galactic passengers on the September flight have since publicly shared their stories , basking in the awe of their experience. Christensen told me that most future tourists will likely do the same. “A big part of the fun is other people knowing that you’ve done it,” she said. Flying to space isn’t exactly something to be modest about: Fewer than 700 people have done it since human beings first achieved the feat, in the early 1960s, and we know all of their names. If Virgin’s new mystery passenger doesn’t reveal their name, they really will make history.

Read: Seeing Earth from space will change you

Many spacefarers—the Soviet cosmonauts who inhabited the first space station, the American astronauts who shuttled their way into orbit, the Chinese astronauts living in space right now, all of the people who have flown commercial—have spoken about the transformational wonder of seeing Earth from space, a phenomenon known as the overview effect . They reported that they better understood the reality of our beautiful, fragile planet, and that they felt a duty to share their impressions with people on the ground. Gene Cernan, one of the dozen men who walked on the lunar surface, once said, “If only everyone could relate to the beauty and the purposefulness of it … It wouldn’t bring a utopia to this planet for people to understand it all, but it might make a difference.” In this sense, for a space traveler to remain unknown forever would be a sort of anti–overview effect: Just as they may have the right to request some privacy, they have no obligation to bring the transcendent power of their journey back to Earth.

Three years ago, two NASA astronauts made a historic flight on a new SpaceX astronaut capsule. Ahead of the mission, I asked NASA what Doug Hurley and Bob Behnken were going to have for breakfast on the morning of the launch. It was a question with a long tradition in spacefaring history: During the Apollo days, the public was privy to the final Earth-bound meals of history-making astronauts. NASA officials balked, saying they couldn’t divulge that information for privacy reasons. But on the day of the launch, Hurley, as if to sate the space press corps, posted a picture of his steak and eggs on Twitter (as it was still known then).

Hurley and Behnken’s preflight hours seemed like fair game; after all, these men were government employees, doing their job on their assigned mission. But future passengers may decide that we have no business knowing their breakfast order—or even their name.

Expert Voices

Is Interstellar Travel Really Possible?

Interstellar flight is a real pain in the neck.

Artist’s illustration of a Breakthrough Starshot probe arriving at the potentially Earth-like planet Proxima Centauri b. A representation of laser beams is visible emanating from the corners of the craft’s lightsail.

Paul M. Sutter is an astrophysicist at The Ohio State University , host of Ask a Spaceman and Space Radio , and author of " Your Place in the Universe. " Sutter contributed this article to Space.com's Expert Voices: Op-Ed & Insights . 

Interstellar space travel . Fantasy of every five-year-old kid within us. Staple of science fiction serials. Boldly going where nobody has gone before in a really fantastic way. As we grow ever more advanced with our rockets and space probes, the question arises: could we ever hope to colonize the stars? Or, barring that far-flung dream, can we at least send space probes to alien planets, letting them tell us what they see?

The truth is that interstellar travel and exploration is technically possible . There's no law of physics that outright forbids it. But that doesn't necessarily make it easy, and it certainly doesn't mean we'll achieve it in our lifetimes, let alone this century. Interstellar space travel is a real pain in the neck. 

Related: Gallery: Visions of Interstellar Starship Travel

Voyage outward

If you're sufficiently patient, then we've already achieved interstellar exploration status. We have several spacecraft on escape trajectories, meaning they're leaving the solar system and they are never coming back. NASA's Pioneer missions, the Voyager missions , and most recently New Horizons have all started their long outward journeys. The Voyagers especially are now considered outside the solar system, as defined as the region where the solar wind emanating from the sun gives way to general galactic background particles and dust.

So, great; we have interstellar space probes currently in operation. Except the problem is that they're going nowhere really fast. Each one of these intrepid interstellar explorers is traveling at tens of thousands of miles per hour, which sounds pretty fast. They're not headed in the direction of any particular star, because their missions were designed to explore planets inside the solar system. But if any of these spacecraft were headed to our nearest neighbor, Proxima Centauri , just barely 4 light-years away, they would reach it in about 80,000 years.

I don't know about you, but I don't think NASA budgets for those kinds of timelines. Also, by the time these probes reach anywhere halfway interesting, their nuclear batteries will be long dead, and just be useless hunks of metal hurtling through the void. Which is a sort of success, if you think about it: It's not like our ancestors were able to accomplish such feats as tossing random junk between the stars, but it's probably also not exactly what you imagined interstellar space travel to be like.

Get the Space.com Newsletter

Breaking space news, the latest updates on rocket launches, skywatching events and more!

Related: Superfast Spacecraft Propulsion Concepts (Images)

Speed racer

To make interstellar spaceflight more reasonable, a probe has to go really fast. On the order of at least one-tenth the speed of light. At that speed, spacecraft could reach Proxima Centauri in a handful of decades, and send back pictures a few years later, well within a human lifetime. Is it really so unreasonable to ask that the same person who starts the mission gets to finish it?

Going these speeds requires a tremendous amount of energy. One option is to contain that energy onboard the spacecraft as fuel. But if that's the case, the extra fuel adds mass, which makes it even harder to propel it up to those speeds. There are designs and sketches for nuclear-powered spacecraft that try to accomplish just this, but unless we want to start building thousands upon thousands of nuclear bombs just to put inside a rocket, we need to come up with other ideas.

Perhaps one of the most promising ideas is to keep the energy source of the spacecraft fixed and somehow transport that energy to the spacecraft as it travels. One way to do this is with lasers. Radiation is good at transporting energy from one place to another, especially over the vast distances of space. The spacecraft can then capture this energy and propel itself forward.

This is the basic idea behind the Breakthrough Starshot project , which aims to design a spacecraft capable of reaching the nearest stars in a matter of decades. In the simplest outline of this project, a giant laser on the order of 100 gigawatts shoots at an Earth-orbiting spacecraft. That spacecraft has a large solar sail that is incredibly reflective. The laser bounces off of that sail, giving momentum to the spacecraft. The thing is, a 100-gigawatt laser only has the force of a heavy backpack. You didn't read that incorrectly. If we were to shoot this laser at the spacecraft for about 10 minutes, in order to reach one-tenth the speed of light, the spacecraft can weigh no more than a gram.

That's the mass of a paper clip.

Related: Breakthrough Starshot in Pictures: Laser-Sailing Nanocraft to Study Alien Planets

A spaceship for ants

This is where the rubber meets the interstellar road when it comes to making spacecraft travel the required speeds. The laser itself, at 100 gigawatts, is more powerful than any laser we've ever designed by many orders of magnitude. To give you a sense of scale, 100 gigawatts is the entire capacity of every single nuclear power plant operating in the United States combined.

And the spacecraft, which has to have a mass no more than a paper clip, must include a camera, computer, power source, circuitry, a shell, an antenna for communicating back home and the entire lightsail itself.  

That lightsail must be almost perfectly reflective. If it absorbs even a tiny fraction of that incoming laser radiation it will convert that energy to heat instead of momentum. At 100 gigawatts, that means straight-up melting, which is generally considered not good for spacecraft. 

Once accelerated to one-tenth the speed of light, the real journey begins. For 40 years, this little spacecraft will have to withstand the trials and travails of interstellar space. It will be impacted by dust grains at that enormous velocity. And while the dust is very tiny, at those speeds motes can do incredible damage. Cosmic rays, which are high-energy particles emitted by everything from the sun to distant supernova, can mess with the delicate circuitry inside. The spacecraft will be bombarded by these cosmic rays non-stop as soon as the journey begins.

Is Breakthrough Starshot possible? In principle, yes. Like I said above, there's no law of physics that prevents any of this from becoming reality. But that doesn't make it easy or even probable or plausible or even feasible using our current levels of technology (or reasonable projections into the near future of our technology). Can we really make a spacecraft that small and light? Can we really make a laser that powerful? Can a mission like this actually survive the challenges of deep space?

The answer isn't yes or no. The real question is this: are we willing to spend enough money to find out if it's possible?

  • Building Sails for Tiny Interstellar Probes Will Be Tough — But Not Impossible
  • 10 Exoplanets That Could Host Alien Life
  • Interstellar Space Travel: 7 Futuristic Spacecraft to Explore the Cosmos

Learn more by listening to the episode "Is interstellar travel possible?" on the Ask A Spaceman podcast, available on iTunes and on the Web at http://www.askaspaceman.com . Thanks to @infirmus, Amber D., neo, and Alex V. for the questions that led to this piece! Ask your own question on Twitter using #AskASpaceman or by following Paul @PaulMattSutter and facebook.com/PaulMattSutter .  

Follow us on Twitter @Spacedotcom or Facebook . 

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: [email protected].

Paul Sutter

Paul M. Sutter is an astrophysicist at SUNY Stony Brook and the Flatiron Institute in New York City. Paul received his PhD in Physics from the University of Illinois at Urbana-Champaign in 2011, and spent three years at the Paris Institute of Astrophysics, followed by a research fellowship in Trieste, Italy, His research focuses on many diverse topics, from the emptiest regions of the universe to the earliest moments of the Big Bang to the hunt for the first stars. As an "Agent to the Stars," Paul has passionately engaged the public in science outreach for several years. He is the host of the popular "Ask a Spaceman!" podcast, author of "Your Place in the Universe" and "How to Die in Space" and he frequently appears on TV — including on The Weather Channel, for which he serves as Official Space Specialist.

Lego Creator 3-in-1 Space Astronaut review

NASA's tiny CAPSTONE probe celebrates 450 days in orbit around the moon

Full Worm Moon brings 1st lunar eclipse of 2024 next week. Here's how to see it

Most Popular

By Robert Lea March 19, 2024

By Leonard David March 19, 2024

By Paul Sutter March 19, 2024

By Mike Wall March 19, 2024

By Joe Rao March 19, 2024

By Sharmila Kuthunur March 19, 2024

By Mike Wall March 18, 2024

By Jeff Spry March 18, 2024

By Elizabeth Howell March 18, 2024

By Robert Lea March 18, 2024

  • 2 SpaceX's evening Starlink launch wows West Coast skywatchers (photos)
  • 3 Watch rockin' new trailer for Zack Snyder's 'Rebel Moon Part Two: The Scargiver' (video)
  • 4 Citizen scientists and AI take a cosmic cruise to discover 430,000 new galaxies
  • 5 3D map of over 1 million black holes traces where the universe's dark matter lies
  • AAC Clyde Space
  • Alaska Space
  • Alba Orbital
  • Anders Povlsen
  • Astra Space
  • Black Arrow
  • Blue Origin
  • Catriona Francis
  • Chris Larmour
  • Climate Change
  • Copenhagen Suborbitals
  • Craig Clark
  • Elecnor Deimos
  • Electron Rocket
  • European Space Agency
  • Frank Strang
  • Firefly Aerospace
  • Gilmour Space Technologies
  • Highlands & Islands Enterprise
  • Horizontal Launch
  • ISAR Aerospace
  • Kodiak rocket Launch
  • Kristian Von Bengtson
  • Laura Edison
  • Llandebr Space Centre
  • Lockheed Martin
  • New Shepard
  • Orbex Space
  • Peter Guthrie
  • Peter Madsen
  • Prestwick Spaceport
  • Proton Rocket
  • Richard Branson
  • Rocket Explosion
  • Rocket Factory Augsburg
  • Rocket Launch
  • Satellite Launches
  • Scottish Spaceport
  • Shetland Space Centre (SaxaVord)
  • Skylark Nano
  • Small Satellites
  • Snowdonia spaceport
  • Space Apprenticeship
  • Space Careers
  • Space Debris
  • Space Scholarship
  • Space Tech Expo
  • Space Tourism
  • Spaceport Cornwall
  • Sutherland Spaceport
  • UK Space Agency
  • UK Space Conference
  • UK Space Race
  • UK Spaceport
  • Vertical Launch
  • Virgin Galactic
  • Virgin Orbit
  • Volodymyr Levykin

Future of space travel: What will it be like?

Future of space travel: What will it be like?

More than 60 years have passed since the first human space flight, but the future of space travel is still being written since only about 600 people have been in orbit so far. For most people willing to experience space travel, this wish remains an unattainable dream. But let’s remember that cars, planes, and trains, available to everyone today, seemed a fantasy once. So will space tourism ever be a reality? It already is. More than that, it has been around for 20 years. Orbital Today will shortly remind you of the story and try to look into the future of space travel.

How it all started

A 37-year-old American English and biology teacher Sharon McAuliffe could become the first space tourist, on winning the “Teacher in Space” competition in 1984. By that time, US astronauts had made 55 successful space flights, and their safe return to Earth had become commonplace. to increase public’s interest in the industry and demonstrate space flight reliability, NASA decided to send the first civilian into space. But it all ended in tragedy. On 28th January 1986, 73 seconds after launch, the Challenger’s fuel tank exploded, killing all seven crew members, including McAuliffe. The practice of sending amateurs into space has been abandoned for many years, and the space tourism future was put on hold.

Astronaut Dannis Tito

The second attempt took place in April 2001. American businessman Dan Tito paid Space Adventures a whopping $20 million for a seat on a Russian Soyuz rocket to go to the ISS. The journey lasted ten days, eight of which Tito spent at the station in zero gravity at an altitude of 400km from the Earth in the company of professional astronauts. From 2002 to 2009, another 7 millionaires and billionaires followed his example, but after that, no one wanted to part with a significant sum for years.

The tipping point occurred in the summer of 2021 when private aerospace companies Virgin Galactic and Blue Origin sent their first tourists into space, and while these flights were suborbital, they still determined the future of space tourism trends.

Unlike the $20 million eight-day trip to the ISS, Jeff Bezos and Richard Branson’s companies offer to spend only three minutes in zero gravity, but the fare is also way lower – $200,000. At the same time, Virgin VSS Unity flight takes 2.5 hours, and Blue Origin New Shepard’s – 11 minutes. This time difference is explained by different launch technologies. Virgin uses an air-launch system (similar to an aeroplane), while Blue Origin uses a classic vertical rocket launch. One thing these two have in common is that both offer to enjoy the view of Earth and starts from space, through panoramic windows from a height of more than 60km.

Virgin has made only one tourist launch so far, while Blue Origin carried out three. The pricing policy has fully justified itself. Seats in the suborbital shuttles of both companies are sold out several years in advance.

As the era of suborbital flights officially began, the interest in orbital flights rekindled. Unwilling to lag behind its main competitors, in September 2021, Space X hastened to launch the first Inspiration 4 orbital mission. The mission implied that four tourists stay on the Crew Dragon ship in orbit for three days. Following in Elon Musk’s footsteps, the Russian Soyuz MS 20 delivered Japanese billionaire Yusaka Maezawa and his assistant to the ISS. This marked an important milestone for space tourism in the future.

commercial space travel in 2021: Virgin Galactic, Blue Origin, SpaceX

What is the future of space tourism?

A study by Northern Sky Research (NSR) analysts suggests that over the next 10 years, about 60,000 passengers will go into space, and the total income from space tourism will be about 20 billion US dollars. What will the future of space travel look like?

Suborbital transportation

Private companies will continue to improve suborbital flight technologies, reducing their cost and improving the quality. However, despite this, interest in suborbital tourism is unlikely to last long due to limited supply. The Blue Origin and Virgin Galactic spacecraft can carry a maximum of six people (including two Virgin pilots) and offer only three minutes in zero gravity. Besides, the ships do not cross the Karman line (100km), beyond which real space begins. However, there is hope.

Experts believe that future space travel technology will be able to replace long air flights. In 2020, SpaceX announced its Starship rocket currently in development will be able to take up to 100 passengers on board and deliver them from one continent to another in less than an hour. More specifically, a 15-hour flight to Shanghai from New York on Starship will take only 40 minutes. If Blue Origin and Virgin Galactic follow the same path, while providing adequate service costs, the demand for suborbital flights will grow steadily.

Orbital vacation

Orbital vacation

As more companies consider space tourism, orbital vacations will become one of the future space tourism trends. Orbital infrastructure for recreation, including hotels in orbit and on the moon, could become profitable. Interest in the ISS in this regard is already reemerging. In addition, Orion Span and Blue Origin are developing luxury space hotel concepts called Aurora Station and Orbital Reef . Of course, vacations in space are still far away, but many tourists can already visit space themed hotels on Earth. The best of them are located in China, the USA, Canada, and Switzerland.

Will space tourism ever be affordable?

No doubt, only multi millionaires can afford such trips today. Paying 200 thousand dollars for 3 minutes in weightlessness or 20 million for 8 days in space is not something everyone can easily afford. A century ago, ordinary people could hardly pay for a ticket across the Atlantic, and flying on planes was even more expensive. Today, such trips no longer surprise anyone. Once space tourism becomes mainstream, it will also have a positive impact on many socio-economic processes on Earth: job creation, development of new energy infrastructure based on solar energy, etc. This will increase the scale of opportunity and innovation, boost competition, and ultimately make space travel available for ordinary citizens.

Is space tourism a good idea after all?

Blue Origin shuttle for space tourists

Every industry has positive and negative aspects, and space travel is no exception. Despite the prospects and benefits, this industry calls for careful risk assessment. Let’s take a look at the main facts about future space travel.

1. High expenses

Blue Origin and Virgin Galactic flights require huge investments in infrastructure and technology that are not paying off at this stage. How much does it cost for space tourism? It is difficult to say, but the costs are in the tens of billions. In fact, these are very expensive toys of billionaires. Of course, they can afford such a luxury at the expense of other, highly profitable businesses, but imagine if this money was spent on more pressing issues, i.e., fighting poverty, hunger, medicine, etc.

2. Passenger health

While astronauts take years to prepare for flights, private individuals will fly with minimal instruction. However, heavy workloads and zero-gravity conditions greatly affect health. According to a recent study involving British astronaut Tim Peake , space travel causes more than a third of astronauts to experience temporary anemia due to the destruction of large numbers of red blood cells. While astronauts remain in a state of weightlessness, this does not cause any problems, but the symptoms appear on Earth, under the influence of gravity. This threatens not only the development of space tourism but also the idea of ​​colonising planets since it creates an increased risk for passengers experiencing conditions exacerbated by anemia. Here, we are, first of all, talking about cardiovascular pathologies, which, according to WHO, top the list of common diseases. In other words, you need to be not only rich but absolutely healthy to fly into space. The combination of these factors significantly reduces the number of potential space tourism customers.

3. Environmental impact

A rocket burns hundreds of tons of fuel to overcome the Earth’s gravity and leave the atmosphere. Of course, humanity is inventing ever-more environmentally friendly fuels, but emissions in the upper atmosphere still destroy the ozone layer and provoke global warming. And although the level of emissions from rockets is less than 1% compared with cars, the development of space tourism will inevitably lead to a significant increase in the number of rocket launches, which means an increase in environmental impact risk.

In addition, emissions are not the only problem with a rocket launch . While technology does not yet allow a full transition to a reusable rocket, there remains a high risk of an uncontrolled fall of the first stages to Earth, spills and fuel leaks during transportation, which inevitably destroys the environment.

And yet, despite all cons, the future of space exploration looks quite promising. Rapid technology development can no longer be stopped. In another 5-10 years, getting from London to Sydney by a rocket in half an hour or spending a vacation in orbit could become as commonplace as ordering a taxi or a hotel room today.

' src=

Emma joined the team in 2020 as an Editorial Assistant. She is currently on an internship with us while going through her further education. She is enthusiastic about Science and about Space in particular.

Cancel reply

Thank you for your comment! It will be visible on the site after moderation.

Related Articles

Could this be the Virgin Orbit replacement?

Could this be the Virgin Orbit replacement?

Scotland’s Space Tech Firm Satellite Vu Gets a New Launch Deal with SpaceX

Scotland’s Space Tech Firm Satellite Vu Gets a New Launch Deal with SpaceX

Rocket Launch Schedule that took place in February 2022

Rocket Launch Schedule that took place in February 2022

Explore orbital today.

38 of the Best alien films of all time

38 of the Best alien films of all time

Stellar Romance for Valentine’s Day: 23 Space Themed Gift Ideas!

Stellar Romance for Valentine’s Day: 23 Space Themed Gift Ideas!

History of the 1st Small Satellite Launch

History of the 1st Small Satellite Launch

By continuing to use orbitaltoday.com you will be agreeing to the website Terms and Conditions and the Use of Cookies while using the website and our services. Please also read our Privacy Policy under which, to the extent stated, you consent to the processing of your personal data.

There’s No Way to Make Space Travel Good for Planet Earth Right Now

NASA’s Artemis I Space Launch System (SLS) rocket launched at NASA's Kennedy Space Center on Nov. 16, 2022 in Cape Canaveral, Florida.

S paceX has never been reluctant to brag, especially when it comes to its celebrated Falcon 9 rocket. Since 2010, as a company toteboard shows, 217 Falcon 9s have flown, with 61 launches in 2022 alone, making it the workhorse of the current global space fleet. So what’s not to like? Plenty, actually—at least if you care about the environment.

The Falcon 9 uses a fuel mixture of liquid oxygen and simple kerosene, and while the oxygen does not do any harm to the skies, the black soot created by the burning kerosene is injected directly into the stratosphere—the layer of air ranging from 12 km (7.5 mi.) to 50 km (31 mi.) above the Earth. There the soot lingers for up to five years , absorbing heat, contributing to climate change, and damaging the ozone layer, which exposes the planet to dangerous ultraviolet (UV) radiation. And SpaceX is not remotely alone.

According to a study by the National Oceanic and Atmospheric Administration (NOAA), global rocket launches (of which there were 180 last year, the study notes) inject about 1,000 tons of soot into the upper atmosphere per year. That will only get worse, NOAA warns, as the industry continues to expand. “The bottom line is projected increases in rocket launches could expose people in the Northern Hemisphere [where most rocket launches take place] to increased harmful UV radiation,” environmental scientist Christopher Maloney, the study’s lead author, said in a statement .

By themselves, rocket launches are small contributors to overall atmospheric pollutants. The aviation industry burns 100 times more fuel each year than all of the rockets launched globally combined. But there is a key atmospheric difference: airplanes fly in the troposphere about 11 km (6.6 mi.) above the ground. Soot precipitates quickly from this range compared to stratospheric soot which sticks around much longer. Indeed, according to the NOAA report, a single passenger aboard a rocket is responsible for 100 times more climate-changing pollution than a passenger aboard an airplane.

Not only does all of this warm the planet and damage the ozone, the NOAA scientists warn, but the change in temperatures can also slow subtropical jet streams , worsening summer monsoons in Africa and India. “We need to learn more about the potential impact of hydrocarbon-burning engines on the stratosphere and on the climate at the surface of the Earth,” said Maloney.

A version of this story also appears in the Climate is Everything newsletter. To sign up, click here .

The type of fuel used in the rockets can make a difference. SpaceX’s massive, 33-engine Starship spacecraft , for example, uses methane in place of kerosene. While methane is a powerful greenhouse gas by itself, it does burn cleaner than kerosene, putting out less black soot. Blue Origin’s New Shepard rocket is cleaner still, burning liquid oxygen and liquid hydrogen, and producing only water vapor as an exhaust—water vapor in the upper atmosphere still traps and retains heat, but not nearly as much as black soot, methane, or carbon dioxide do.

None of this means that the private rocket industry or growing space powers like China, India, and the United Arab Emirates—to say nothing of the U.S.—will be slowing down their launch schedules or becoming less pollution-intensive any time soon. Indeed, NASA’s new Space Launch System moon rocket, which first launched in November 2022, is an especially dirty machine. While it uses a liquid oxygen-hydrogen mix in its four main engines, its two attached solid fuel engines, which account for most of the vehicle’s thrust, produce the ozone-damaging pollutant chlorine.

The thriving space industry is typically seen as a boon for both the economy and for human exploration—and it is. But the launching of a monster rocket—with monster exhaust—like SpaceX’s anticipated Starship is a reminder that there can be too much of a good thing. If we keep increasing not just the size of rockets but the number of launches, we do so at a price; and as with so many other things, it is the climate that pays.

More Must-Reads From TIME

  • Why We're Spending So Much Money Now
  • The Financial Influencers Women Actually Want to Listen To
  • Breaker Sunny Choi Is Heading to Paris
  • The Long, Strange History of Secret Royal Ailments
  • The UAE Is on a Mission to Become an AI Power
  • Why TV Can’t Stop Making Silly Shows About Lady Journalists
  • The Case for Wearing Shoes in the House
  • Want Weekly Recs on What to Watch, Read, and More? Sign Up for Worth Your Time

Write to Jeffrey Kluger at [email protected]

You May Also Like

Space Tourism: Can A Civilian Go To Space?

Space Tourism

2021 has been a busy year for private space tourism: overall, more than 15 civilians took a trip to space during this year. In this article, you will learn more about the space tourism industry, its history, and the companies that are most likely to make you a space tourist.

What is space tourism?

Brief history of space tourism, space tourism companies, orbital and suborbital space flights, how much does it cost for a person to go to space, is space tourism worth it, can i become a space tourist, why is space tourism bad for the environment.

Space tourism is human space travel for recreational or leisure purposes . It’s divided into different types, including orbital, suborbital, and lunar space tourism.

However, there are broader definitions for space tourism. According to the Space Tourism Guide , space tourism is a commercial activity related to space that includes going to space as a tourist, watching a rocket launch, going stargazing, or traveling to a space-focused destination.

The first space tourist was Dennis Tito, an American multimillionaire, who spent nearly eight days onboard the International Space Station in April 2001. This trip cost him $20 million and made Tito the first private citizen who purchased his space ticket. Over the next eight years, six more private citizens followed Tito to the International Space Station to become space tourists.

As space tourism became a real thing, dozens of companies entered this industry hoping to capitalize on renewed public interest in space, including Blue Origin in 2000 and Virgin Galactic in 2004. In the 2000s, space tourists were limited to launches aboard Russian Soyuz aircraft and only could go to the ISS. However, everything changed when the other players started to grow up on the market. There are now a variety of destinations and companies for travels to space.

There are now six major space companies that are arranging or planning to arrange touristic flights to space:

  • Virgin Galactic;
  • Blue Origin;
  • Axiom Space;
  • Space Perspective.

While the first two are focused on suborbital flights, Axiom and Boeing are working on orbital missions. SpaceX, in its turn, is prioritizing lunar tourism in the future. For now, Elon Musk’s company has allowed its Crew Dragon spacecraft to be chartered for orbital flights, as it happened with the Inspiration4 3-day mission . Space Perspective is developing a different balloon-based system to carry customers to the stratosphere and is planning to start its commercial flights in 2024.

Orbital and suborbital flights are very different. Taking an orbital flight means staying in orbit; in other words, going around the planet continually at a very high speed to not fall back to the Earth. Such a trip takes several days, even a week or more. A suborbital flight in its turn is more like a space hop — you blast off, make a huge arc, and eventually fall back to the Earth, never making it into orbit. A flight duration, in this case, ranges from 2 to 3 hours.

Here is an example: a spaceflight takes you to an altitude of 100 km above the Earth. To enter into orbit — make an orbital flight — you would have to gain a speed of about 28,000 km per hour (17,400 mph) or more. But to reach the given altitude and fall back to the Earth — make a suborbital flight — you would have to fly at only 6,000 km per hour (3,700 mph). This flight takes less energy, less fuel; therefore, it is less expensive.

  • Virgin Galactic: $250,000 for a 2-hour suborbital flight at an altitude of 80 km;
  • Blue Origin: approximately $300,000 for 12 minutes suborbital flight at an altitude of 100 km;
  • Axiom Space: $55 million for a 10-day orbital flight;
  • Space Perspective: $125,000 for a 6-hour flight to the edge of space (32 km above the Earth).

The price depends, but remember that suborbital space flights are always cheaper.

What exactly do you expect from a journey to space? Besides the awesome impressions, here is what you can experience during such a trip:

  • Weightlessness . Keep in mind that during a suborbital flight you’ll get only a couple of minutes in weightlessness, but it will be truly fascinating .
  • Space sickness . The symptoms include cold sweating, malaise, loss of appetite, nausea, fatigue, and vomiting. Even experienced astronauts are not immune from it!
  • G-force . 1G is the acceleration we feel due to the force of gravity; a usual g-force astronauts experience during a rocket launch is around 3gs. To understand how a g-force influences people , watch this video.

For now, the most significant barrier for space tourism is price. But air travel was also once expensive; a one-way ticket cost more than half the price of a new car . Most likely, the price for space travel will reduce overtime as well. For now, you need to be either quite wealthy or win in a competition, as did Sian Proctor, a member of Inspiration4 mission . But before spending thousands of dollars on space travel, here is one more fact you might want to consider.

Rocket launches are harmful to the environment in general. During the burning of rocket fuels, rocket engines release harmful gases and soot particles (also known as black carbon) into the upper atmosphere, resulting in ozone depletion. Think about this: in 2018 black-carbon-producing rockets emitted about the same amount of black carbon as the global aviation industry emits annually.

However, not all space companies use black carbon for fuel. Blue Origin’s New Shepard rocket has a liquid hydrogen-fuelled engine: hydrogen doesn’t emit carbon but simply turns into water vapor when burning.

The main reason why space tourism could be harmful to the environment is its potential popularity. With the rising amount of rocket launches the carbon footprint will only increase — Virgin Galactic alone aims to launch 400 of these flights annually. Meanwhile, the soot released by 1,000 space tourism flights could warm Antarctica by nearly 1°C !

Would you want to become a space tourist? Let us know your opinion on social media and share the article with your friends, if you enjoyed it! Also, the Best Mobile App Awards 2021 is going on right now, and we would very much appreciate it if you would vote for our Sky Tonight app . Simply tap "Vote for this app" in the upper part of the screen. No registration is required!

SpaceX is poised to make rocket launches 10 times cheaper with Starship, experts say

  • With its recent Starship mission, SpaceX is poised to cut launch costs 10-fold, said an expert 
  • The firm flew its flagship mega-rocket to space without exploding on Thursday for the first time. 
  • Bringing down launch costs is crucial to open up space to industry. 

Insider Today

SpaceX's Starship launch on Thursday didn't only look cool . It may have marked a major turning point for the space industry.

Elon Musk's enormous mega-rocket , which didn't carry a payload or people, did not survive the landing on Thursday. But it did cruise through space and plummet back through Earth's atmosphere before exploding, a watershed moment for SpaceX, 22 years to the day after it was founded.

The rapid progress of the Starship-Super Heavy launch system's development offers high hopes the 400-foot-tall behemoth will be fully functional — and fully reusable — very soon.

The mega-rocket is key to Elon Musk's ambition to bring costs down to about $10 million per launch , a crucial move for those vying to set up their futuristic industries in space like asteroid mining, or space factories.

"With Starship, SpaceX is poised to slash launch costs by an order of magnitude again," Brendan Rosseau, a teaching fellow at Harvard Business School writing a book about the space industry, told Business Insider in an email on Thursday.

Liftoff of Starship! pic.twitter.com/FaNcasuKaq — SpaceX (@SpaceX) March 14, 2024

SpaceX has already shaved launch costs down

Starship-Super Heavy is the biggest launch system ever developed. The Super Heavy booster that hauls Starship up to space can produce twice as much thrust as the rockets that sent Apollo astronauts to the moon.

When fully developed, it should be able to launch as much as 150 metric tonnes to orbit.

That's a lot of cargo. By comparison, SpaceX's workhorse, Falcon 9, carries around 50,000 pounds to low-Earth orbit on each launch.

That offers substantial economies of scale, as more payload could go on each launch.

But it also helps firms put considerably less money into prepping their payload.

"For the history of spaceflight, the way you get your payload onto a rocket is you shrink it. And when you shrink it, you just spend a lot of money to shrink your technology," Abhi Tripathi, director of Mission Operations at the University of California Berkeley's Space Sciences Laboratory, told BI Friday.

Related stories

"Starship offers you the ability to reverse that equation. It offers you the ability to use cruder technology. Don't waste time shrinking and miniaturizing your thing, use something off the shelf," he said.

An enormous launcher you could use again and again

SpaceX isn't only betting on the rocket's enormous capacity to shave costs. Its main gamble is making the 400-foot tall mega-rocket fully reusable.

Think about how much a plane ride might cost if the airline had to build a new plane every time. That's how most of the launch industry handles rockets.

Reusability offers huge opportunities to cut the bill. And this isn't a stab in the dark — SpaceX has already proved the business model works with Falcon 9.

The midsize rocket's booster doesn't get discarded. Instead, after each launch, it lands to fly another day. With this technology, SpaceX was able to offer cheap and quick turnaround launches at around $67 million per flight.

That's about $1,500 per pound of payload. By comparison, the Space Shuttle charged about $25,000 per pound up to 2011.

Starship's promise is to fully reuse both stages, indefinitely.

This could change everything.

"They are demonstrating that they are right on track to get to where they want to be in an amazingly short period of time," George Nield, former associate administrator of the FAA's Office of Commercial Space Transportation, told BI.

"This vehicle is so different, and it's so much more capable than anything that anybody has ever tried to do. I think folks are not necessarily appreciating that," said Nield.

A way to go, but the end is near

With these advances, business plans for space industries — like manufacturing products at scale in the vacuum of space or mining rare minerals on asteroids — could gain more traction among backers.

"Those high costs significantly limited the scope of space activities, constraining who could use space, how they used space, and who could benefit," Harvard's Rosseau said.

"Lowering launch costs has always been the first step to unlocking broader, deeper sources of value from space," he said.

SpaceX is poised to plow ahead after Thursday's success. Still, there's work to do before industries can pop their payload on Starship at low cost.

As part of Musk's equation, SpaceX needs Starship and its booster to be fully reusable. This wasn't attempted on Wednesday, and booster and ship were lost on re-entry.

Tripathi predicts they are not too far off, however. He thinks SpaceX could try to deliver Starlink satellites on Starship's next test launch.

For reusability, "I think this test showed they probably have another test or two to go," he said.

"I think the smart people have already been planning as if Starship will be successful. Certainly, the ones that were on the fence may have started to come off the fence as of the test [on Thursday]," Tripathi said.

Watch: What happens when Elon Musk moves markets with a tweet

space travel is

  • Main content

Image that reads Space Place and links to spaceplace.nasa.gov.

Is Time Travel Possible?

We all travel in time! We travel one year in time between birthdays, for example. And we are all traveling in time at approximately the same speed: 1 second per second.

We typically experience time at one second per second. Credit: NASA/JPL-Caltech

NASA's space telescopes also give us a way to look back in time. Telescopes help us see stars and galaxies that are very far away . It takes a long time for the light from faraway galaxies to reach us. So, when we look into the sky with a telescope, we are seeing what those stars and galaxies looked like a very long time ago.

However, when we think of the phrase "time travel," we are usually thinking of traveling faster than 1 second per second. That kind of time travel sounds like something you'd only see in movies or science fiction books. Could it be real? Science says yes!

Image of galaxies, taken by the Hubble Space Telescope.

This image from the Hubble Space Telescope shows galaxies that are very far away as they existed a very long time ago. Credit: NASA, ESA and R. Thompson (Univ. Arizona)

How do we know that time travel is possible?

More than 100 years ago, a famous scientist named Albert Einstein came up with an idea about how time works. He called it relativity. This theory says that time and space are linked together. Einstein also said our universe has a speed limit: nothing can travel faster than the speed of light (186,000 miles per second).

Einstein's theory of relativity says that space and time are linked together. Credit: NASA/JPL-Caltech

What does this mean for time travel? Well, according to this theory, the faster you travel, the slower you experience time. Scientists have done some experiments to show that this is true.

For example, there was an experiment that used two clocks set to the exact same time. One clock stayed on Earth, while the other flew in an airplane (going in the same direction Earth rotates).

After the airplane flew around the world, scientists compared the two clocks. The clock on the fast-moving airplane was slightly behind the clock on the ground. So, the clock on the airplane was traveling slightly slower in time than 1 second per second.

Credit: NASA/JPL-Caltech

Can we use time travel in everyday life?

We can't use a time machine to travel hundreds of years into the past or future. That kind of time travel only happens in books and movies. But the math of time travel does affect the things we use every day.

For example, we use GPS satellites to help us figure out how to get to new places. (Check out our video about how GPS satellites work .) NASA scientists also use a high-accuracy version of GPS to keep track of where satellites are in space. But did you know that GPS relies on time-travel calculations to help you get around town?

GPS satellites orbit around Earth very quickly at about 8,700 miles (14,000 kilometers) per hour. This slows down GPS satellite clocks by a small fraction of a second (similar to the airplane example above).

Illustration of GPS satellites orbiting around Earth

GPS satellites orbit around Earth at about 8,700 miles (14,000 kilometers) per hour. Credit: GPS.gov

However, the satellites are also orbiting Earth about 12,550 miles (20,200 km) above the surface. This actually speeds up GPS satellite clocks by a slighter larger fraction of a second.

Here's how: Einstein's theory also says that gravity curves space and time, causing the passage of time to slow down. High up where the satellites orbit, Earth's gravity is much weaker. This causes the clocks on GPS satellites to run faster than clocks on the ground.

The combined result is that the clocks on GPS satellites experience time at a rate slightly faster than 1 second per second. Luckily, scientists can use math to correct these differences in time.

Illustration of a hand holding a phone with a maps application active.

If scientists didn't correct the GPS clocks, there would be big problems. GPS satellites wouldn't be able to correctly calculate their position or yours. The errors would add up to a few miles each day, which is a big deal. GPS maps might think your home is nowhere near where it actually is!

In Summary:

Yes, time travel is indeed a real thing. But it's not quite what you've probably seen in the movies. Under certain conditions, it is possible to experience time passing at a different rate than 1 second per second. And there are important reasons why we need to understand this real-world form of time travel.

If you liked this, you may like:

Illustration of a game controller that links to the Space Place Games menu.

More From Forbes

This company is hosting the first michelin-starred meal in space.

  • Share to Facebook
  • Share to Twitter
  • Share to Linkedin

For the sky-high price of $495,000 per-passenger, this once-in-a-lifetime experience will be out of this world.

Specializing in luxury space travel, Space VIP has partnered with Michelin-starred Chef Rasmus Munk ... [+] to host a stratospheric dining experience at the edge of space.

How far are you willing to travel for a really great meal?

How about 100,000 feet above sea level on a six-hour stratospheric adventure that will take you to the edge of space and back?

In an announcement made by luxury space travel operator SpaceVIP on Friday, the mission-based expedition company said they’re teaming up with acclaimed chef Rasmus Munk and are offering six intrepid travelers the mission and memories of a lifetime when they host the first Michelin-starred meal on the edge of space in 2025.

“This announcement has already cast its spotlight on space tourism and we are thrilled about the dialogue it has started around the importance of space travel,” SpaceVIP founder Roman Chiporukha wrote via email to Forbes .

The expedition will take place aboard Space Perspective Spaceship Neptune, the world's first ... [+] carbon-neutral spaceship.

Best High-Yield Savings Accounts Of 2024

Best 5% interest savings accounts of 2024.

One small step for man, one giant leap for a Michelin-starred meal, the experience will take place aboard Spaceship Neptune for the astronomical price of $495,000 per-person. The world's first carbon-neutral spacecraft, the launch date has been set for late 2025 and will depart from the Kennedy Space in Florida.

According to the press release, the flight will last around six-hours in total and will take place in a pressurized capsule that is lifted into the sky by a stratospheric space-balloon. While onboard, participants will have access to Wi-Fi and will be able to livestream the entire experience with friends and family on earth.

Explorers will ascend 100,000 ft above sea level where they will dine as they watch the sunrise over ... [+] the Earth’s curvature in this cozy capsule.

After purchasing three capsules from a Florida-based company Space Perspective in 2021, Chiporukha says SpaceVIP has been developing partnerships with artists that are designed to elevate human consciousness through the power of space travel.

“It is by launching these flights that we will be able to make them accessible to more people,” Chiporukha said. “In the 1920’s, a ticket for a transatlantic flight was prohibitively expensive and accessible only to the elite, however, with advancements in technology, and the growth of the airline industry, air travel became more affordable over time. This is just the beginning of private space travel, so we absolutely see it going in the same direction,” he added.

Two-Michelin-star chef Rasmus Munk has announced plans to create an out of this world menu that will ... [+] be serves aboard a pressurized capsule at the edge of space.

Known for his highly immersive, holistic fine-dining restaurant, Alchemist , chef Rasmus Munk has two-Michelin stars under his belt and his Copenhagen-based restaurant is ranked among the top five best restaurants in the world.

According to Chiporukha, SpaceVIP tapped Munk for this experience because he believes his approach to the dining experience is created through the lens of social impact. “We started our conversation with Chef Rasmus last Fall and it quickly became clear that we were aligned in our purpose-driven approach to this experience,”Chiporukha said.

The journey is set to launch from the Kennedy Space Center starting at the price of $495k per ticket ... [+] and the proceeds will be directed to the Space Prize Foundation.

The specifics around the menu, and how the meal will be served is the “next phase” of the expedition planning process, however dishes will be “inspired by the role of space exploration over the last 60-years of human history and the impact it has had on society,” Chiporukha said.

In the meantime, Chiporukha says SpaceVIP has already had dozens of qualified participants express interest in the Michelin-starred meal experience and he expects they will secure the seats of all six passengers “sooner than expected.”

“The majesty of watching the sun rise over our planet brings into focus the profound understanding that we collectively have one home, a feeling that no other human experience can evoke at such an emotional depth,” Chiporukha said.

Included in the price of admission, passengers will be outfitted by French fashion house Ogier whose custom outfits will use “cutting-edge fabric technology” specific to this mission.

The experience was inspired by the role of space exploration during the last 60 years of human ... [+] history, and the impact it's had on society.

“When we figure out how to grow plants in space with minimal water, these solutions can be utilized on Earth in places like South Africa or California that are having unprecedented droughts,” Chiporukha said. “Our goal is to increase awareness and bring people together so that, in solidarity, we can come up with solutions that benefit us all.”

Over the course of the six-hour journey, Chef Rasmus will tell an intentional story through the ... [+] language of Holistic Cuisine that will challenge the diner to reexamine their relationship with Earth and those who inhabit it.

As plans for this culinary ‘odyssey to the cosmos’ continues to evolve, Chiporukha says SpaceVIP will continue to promote the transformative power of space travel.

In addition to this being the first Michelin-starred mean served in space, all of the proceeds for this will be directed to the Space Prize Foundation . “Whether it's a zero gravity flight or an orbital mission, we are the destination for all space tourism experiences,” Chiporukha said “We're excited to be at the forefront of this new world and to continue to promote universal space literacy through the Space Prize Foundation.”

Michelle Gross

  • Editorial Standards
  • Reprints & Permissions

We've detected unusual activity from your computer network

To continue, please click the box below to let us know you're not a robot.

Why did this happen?

Please make sure your browser supports JavaScript and cookies and that you are not blocking them from loading. For more information you can review our Terms of Service and Cookie Policy .

For inquiries related to this message please contact our support team and provide the reference ID below.

IMAGES

  1. What is Space Travel? the best Astronomy blog for facts about the

    space travel is

  2. 10 Amazing Facts About Space Travel

    space travel is

  3. Space exploration

    space travel is

  4. Space Travel Wallpapers

    space travel is

  5. The Most Important Events of the year in Space Exploration

    space travel is

  6. Your Ticket to Space Travel

    space travel is

VIDEO

  1. When Will Space Travel Be Accessible To All? #neildegrassetyson

  2. Space Travel

  3. #amazing space travel #youtubeshorts #shorts #viral #viralvideo

  4. Moondrop Space Travel

  5. Space Travel 2021//Teknival Italy (Video Cuts)

  6. space travel begins #viral #gameplay #ボカコレ2022春 #music

COMMENTS

  1. The future of spaceflight—from orbital vacations to humans on Mars

    NASA aims to travel to the moon again—and beyond. Here's a look at the 21st-century race to send humans into space. Private spaceflight is not a new concept. In the United States, commercial ...

  2. Space exploration

    Space exploration is the use of astronomy and space technology to explore outer space. [1] While the exploration of space is currently carried out mainly by astronomers with telescopes, its physical exploration is conducted both by uncrewed robotic space probes and human spaceflight. Space exploration, like its classical form astronomy, is one ...

  3. Space Travel Technology

    Space Travel. The path to the Moon, Mars, and beyond requires technologies to get us where we need to go quickly, safely and efficiently. Space travel includes launch and in-space propulsion systems, cryogenic fluid management, and thermal management, as well as navigation and landing systems to get our supplies, equipment, and robotic or human ...

  4. Why Go to Space

    Space exploration unites the world to inspire the next generation, make ground-breaking discoveries, and create new opportunities. Technologies and missions we develop for human spaceflight have thousands of applications on Earth, boosting the economy, creating new career paths, and advancing everyday technologies all around us.

  5. Space exploration

    space exploration, investigation, by means of crewed and uncrewed spacecraft, of the reaches of the universe beyond Earth 's atmosphere and the use of the information so gained to increase knowledge of the cosmos and benefit humanity. A complete list of all crewed spaceflights, with details on each mission's accomplishments and crew, is ...

  6. Everything you need to know about space travel (almost)

    We're a long way from home...

  7. NASA's SpaceX Crew-8 Launches to International Space Station

    An international crew of four reached orbit following a successful launch to the International Space Station at 10:53 p.m. EST Sunday from Launch Complex 39A at NASA's Kennedy Space Center in Florida. NASA's SpaceX Crew-8 mission is the agency's eighth commercial crew rotation mission with the company to the space station.

  8. 3 predictions for the future of space exploration

    Axiom Space. 1. Space exploration will be a mix of public and private money. If you look at even the NASA missions returning to the moon, lots of different private space companies are involved in ...

  9. Here's a Sneak Peek at the Far-Out Future of Space Travel

    Here's a Sneak Peek at the Far-Out Future of Space Travel As NASA develops plans for exploring the moon and Mars, the agency is seeking cutting-edge research that could turn science fiction into ...

  10. How Space Tourism Is Skyrocketing

    Jason Lyon. By Debra Kamin. May 7, 2022. Ilida Alvarez has dreamed of traveling to space since she was a child. But Ms. Alvarez, a legal-mediation firm owner, is afraid of flying, and she isn't ...

  11. Space tourism took a giant leap in 2021: Here's 10 milestones from the

    5) SpaceX stacks tallest booster ever with Starship. SpaceX's first orbital Starship SN20 is stacked atop its massive Super Heavy Booster 4 for the first time on Aug. 6, 2021 at the company's ...

  12. Why space is the impossible frontier

    Humans cannot leave Earth for the several years that it takes to travel to Mars and back, for the simple reason that our biology is intimately connected to Earth. To function properly, we need ...

  13. History of Space Travel

    History of Space Travel. Learn about the history of humans traveling into space. The first earthling to orbit our planet was just two years old, plucked from the streets of Moscow barely more than a week before her historic launch. Her name was Laika. She was a terrier mutt and by all accounts a good dog. Her 1957 flight paved the way for space ...

  14. How to prepare for a trip to space

    With more people having access to space travel today than ever before, successful and safe spaceflights require varying levels of preparation before launch day. For government astronauts, candidates undergo a rigorous two-year initial training period before qualifying for flight assignment. This training includes learning about Space Station ...

  15. The Great Debate: Could We Ever Travel through Time?

    [CLIP: Stephen Hawking Time Travel Party: "Here is the invitation, giving the exact coordinates in time and space. I am hoping in one form or another it will survive for many thousands of years."]

  16. Voyager 1, First Craft in Interstellar Space, May Have Gone Dark

    Voyager 1, the farthest man-made object in space, hasn't sent coherent data to Earth since November. NASA has been trying to diagnose what the Voyager mission's project manager, Suzanne Dodd ...

  17. Virgin Galactic launches first tourism mission after decades of ...

    CNN —. Virgin Galactic — the space tourism company founded by British billionaire Richard Branson — finally launched its first space tourists to the edge of the cosmos, a major step toward ...

  18. Space Tourism Is Here: Booking a Trip to the Final Frontier

    An American real estate investor, a Canadian investor, a former Israeli Air Force pilot, and an ex-Space Shuttle pilot will launch on an incredible orbital mission in its Crew Dragon spacecraft ...

  19. Human Space Travel Research

    Travel to the Moon, Mars, and beyond will require new systems to provide medical care far from Earth. Learn more about the changes humans may undergo during spaceflight, as well as the steps NASA takes to keep astronauts healthy and safe. NASA astronaut and Flight Engineer Andrew Morgan flexes his muscles in an airlock of the space station.

  20. Space Tourism Is Getting More Secretive

    00:00. 09:13. Listen to more stories on hark. Of all the high-flying tourism ventures spawned by space-obsessed billionaires, Virgin Galactic, founded by Richard Branson, offers perhaps the most ...

  21. Is Interstellar Travel Really Possible?

    The truth is that interstellar travel and exploration is technically possible. There's no law of physics that outright forbids it. But that doesn't necessarily make it easy, and it certainly doesn ...

  22. Space Travel Updates: When Will We Be Able To Travel To Space?

    Blue Origin is also sending its first crewed suborbital space flight on July 20, 2021. That's nine days after Virgin Galactic's first flight, but the Blue Origin vehicle will fly an additional ...

  23. Future of space travel: What will it be like?

    17th Mar 2022. 🔊 Listen to this. More than 60 years have passed since the first human space flight, but the future of space travel is still being written since only about 600 people have been in orbit so far. For most people willing to experience space travel, this wish remains an unattainable dream. But let's remember that cars, planes ...

  24. Is Space Travel Good for the Environment? No

    There's No Way to Make Space Travel Good for Planet Earth Right Now. 4 minute read. NASA's Artemis I Space Launch System (SLS) rocket launched at NASA's Kennedy Space Center on Nov. 16, 2022 ...

  25. What Is Space Tourism

    Most likely, the price for space travel will reduce overtime as well. For now, you need to be either quite wealthy or win in a competition, as did Sian Proctor, a member of Inspiration4 mission. But before spending thousands of dollars on space travel, here is one more fact you might want to consider. Why is space tourism bad for the environment?

  26. Starship Launch Success Brings Musk's Vision of Cheap Space Travel Closer

    An image of a chain link. It symobilizes a website link url. Copy Link SpaceX's Starship launch on Thursday didn't only look cool. It may have marked a major turning point for the space industry ...

  27. Is Time Travel Possible?

    The Short Answer: Although humans can't hop into a time machine and go back in time, we do know that clocks on airplanes and satellites travel at a different speed than those on Earth. We all travel in time! We travel one year in time between birthdays, for example. And we are all traveling in time at approximately the same speed: 1 second per ...

  28. This Company Is Hosting The First Michelin-Starred Meal In Space

    For the sky-high price of $495,000 per-passenger, this once-in-a-lifetime experience will be out of this world. Specializing in luxury space travel, Space VIP has partnered with Michelin-starred ...

  29. World's Most Expensive Michelin Meal Is $500k and Served in Space

    A Famed Danish Chef Is Offering High-End Space Dining for $500,000. More people are interested in the first trip than can fit in the spacecraft. Rasmus Munk's multi-course stratospheric menu ...