interstellar travel how does it work

How Interstellar Space Travel Works (Infographic)

Even the fastest humans and spacecraft launched thus far would take many thousands of years to reach the closest stars. Speeds about 75 times faster than this would be required if we hope to make an interstellar trip in less than a hundred years.

To understand the difficulty of interstellar travel, one must comprehend the incredible distance involved. Even the closest star is more than 266,000 times farther away than our own sun. Consider the speed of light . Light, the fastest thing known, takes only 8 minutes to travel to us from the sun, but requires more than four years to get to the nearest star. A handgun bullet travels at 720 miles per hour, but would take nearly 4 million years to get to the nearest star. The fastest object ever launched into space is the Voyager 1 probe , and it would take nearly 75,000 years to make the trip. Today’s chemical rockets are far too slow for interstellar travel . To have a hope of reaching the closest star in less than a hundred years, we would have to accelerate a starship to nearly 30 million mph. Rockets using nuclear fusion or antimatter propulsion could do the job, but they would have to be developed. It is theoretically possible that by warping space, a starship might travel faster than light without violating the laws of physics within its own bubble of space-time.

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Karl's association with Space.com goes back to 2000, when he was hired to produce interactive Flash graphics. From 2010 to 2016, Karl worked as an infographics specialist across all editorial properties of Purch (formerly known as TechMediaNetwork).  Before joining Space.com, Karl spent 11 years at the New York headquarters of The Associated Press, creating news graphics for use around the world in newspapers and on the web.  He has a degree in graphic design from Louisiana State University and now works as a freelance graphic designer in New York City.

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Nasa technologist talks what’s needed for interstellar travel.

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Interstellar travel is one of the most frustrating topics in all of astrophysics. Despite hundreds of articles, movies and TV shows devoted to the subject, in most professional astronomical circles the issue seems about as welcome as the Grinch at Christmas.

It's a fascinating topic. But no one can say with certainty that humans will ever be able to send robotic probes to visit another star system, much less colonize an extrasolar earthlike planet.

And, sadly, none of the major space agencies seem to have a long-term itch to send spacecraft on dedicated interstellar precursor missions.

Sending a 500 kg – 1000 kg robotic spacecraft to another star with a realistic travel time of a few hundred years will not likely be technologically feasible for another 75 – 150 years, Les Johnson, author of “A Traveler's Guide to the Stars,” and a propulsion technologist at NASA Marshall Space Flight Center, told me via email. But he admits that if in 1990 someone had asked him how long it would take for Earth to have its current system of global telephony, he would have said far longer than it’s taken.

Even though Johnson is a longtime advocate of interstellar propulsion research, he is emphatic to note that his views on the subject are not NASA’s but rather very much his own. All of which begs the question: Why do mainstream rocket scientists and theoretical physicists appear to be so reluctant to discuss interstellar propulsion?

The distances are vast, and the energies required are almost unimaginably large, says Johnson. Thus, the steps we must take between today’s state of the art and the propulsion systems required are so numerous that they consider it to be science fiction, he says. Traveling to the stars is important, but we will likely not seriously begin considering them until we are masters of our own solar system, says Johnson.

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What should we be doing to make interstellar travel possible?

“We need to bring back funding for basic research and development and run away from the notion that all R&D must have a near-term return on investment,” said Johnson.

Some form of warp drive is likely the most feasible way to enable realistic Star Trek-styled travel since each warp factor is a multiple of the speed of light cubed. As Johnson explains in “A Traveler’s Guide to the Stars,” Warp drive “uses tremendous energies to change the shape of space-time, allowing the ship to cross normal, albeit warped/compressed/expanded space very quickly.”

In a now-famous 1994 refereed paper, Mexican theoretical physicist Miguel Alcubierre describes a warp drive that “works mathematically and would allow a starship to appear to be traveling faster than light, while not really doing so,” Johnson notes in his book.

Can Alcubierre’s warp drive work?

The Alcubierre Drive postulates that a spaceship might appear to move faster-than-light by contracting space in front of it and expanding space behind it, thereby riding spacetime like a surfer rides a wave, says Johnson.

“After the ship crosses the contracted space-time, it expands back to normal size behind the ship, leaving nature beautifully intact and space-time undisturbed, with the ship appearing to move much faster than light,” Johnson notes in his book.

The mathematics is “elegant,” but to achieve the energies necessary to make the Alcubierre Drive a reality would require the existence of negative mass (where 1 kg would be -1kg), says Johnson. No one has ever detected negative mass and there is no evidence that it exists, he says. And until we find some, the Alcubierre Drive will remain speculative physics, says Johnson.

A Traveler's Guide to the Stars

So, when can we expect human astronauts to touch down on an Earth 2.0?

The likelihood of finding an Earth 2.0 anywhere in the galaxy is very small, but probably not zero, says Johnson. However, the chances of finding it relatively close to Earth are so small as to be rounded to zero, he says. That does not mean we will not take such voyages; it does mean that we will likely need to not only learn how to travel to distant stars, but also how to terraform distant planets to make them truly habitable, Johnson says.

Does technology that could take us to the stars already exist in someone’s lab here on Earth?

It’s possible that the big new idea that brings interstellar travel closer to reality has already been envisioned by someone, somewhere in the world, says Johnson. But to meet the challenges of interstellar travel, we will need many big, new ideas and approaches, he says.

To that end, this coming July in Montreal, Johnson and colleagues are taking part in The 8th Interstellar Symposium, an interdisciplinary, global meeting of researchers working to one day make interstellar travel possible.

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Interstellar travel: From science fiction to reality

Humans may one day travel beyond the solar system on board rockets powered by nuclear fusion.

An artist's impression of the Voyager 1 spacecraft entering interstellar space. Photo: Nasa

Only two probes have reached interstellar space – the region beyond the solar system – since the start of human space exploration .

It took more than three decades for the first spacecraft, Voyager 1 , to cross the heliopause, a boundary scientists believe is where interstellar space begins, after its launch in 1977.

It was an incredible achievement with invaluable data sent back through a medium not influenced by the Sun.

But with its power supply weakening it is almost impossible Voyager 1 will reach our nearest star, Proxima Centauri, which is 4.2 light years away and would take the probe almost 73,000 years.

Les Johnson, a Nasa scientist and author of several scientific and science fiction books, told The National reaching another star could take 50 to 100 years.

“It is possible we might have the technology to send our first robotic probe to another star within the next 50 to 100 years,” said Mr Johnson, who managed the Interstellar Propulsion Research Project at the US space agency.

“Based on the rate of technology growth, after looking at all the propulsion systems that are based on known physics, I believe these first probes will be propelled to the stars using laser light reflecting from a sail, similar to today’s solar sails but driven by intense laser light instead of sunlight.”

Human travel to interstellar space

It could take significantly longer for a crewed mission to travel to another star, as laser light sails would only work for smaller spacecraft.

Nuclear fusion propulsion, a way of powering a spacecraft using high-energy particles created by fusion reactions, is needed to make human missions to interstellar space possible.

“As for humans, that’s a lot more complicated because it takes a lot of mass to keep a group of humans alive for a decade- to centuries-long space journey and that means a massive ship,” Mr Johnson said.

“For a human crewed ship, we will need fusion propulsion at a minimum and antimatter as the ideal.

“While we know these are physically possible, the technology level needed for interstellar travel seems very far away – perhaps 100 to 200 years in the future.”

While scientists dream of antimatter propulsion, which could enable space travel at 70 per cent of the speed of light, nuclear fusion propulsion appears much closer to reality.

The technology could also help reduce the time it takes to reach Mars, the planet to which most space agencies are trying to send their astronauts.

Laura Forczyk, an author and the founder of space consulting firm Astralytical, said nuclear fusion propulsion has the potential to revolutionise space flight.

"We will not be able to achieve interstellar travel until we engineer a faster and more efficient means of accelerating," said Ms Forczyk.

"We also need to develop long-term, self-sustained robust ecosystems for long-duration voyages and a better means of radiation shielding. We are at least a century away from these advances."

While developing nuclear fusion technology is not easy, with the required temperature to achieve it 10 times hotter than the Sun, a few companies have been trying for many years.

California-based start-up Helicity Space recently received $5 million in seed funding to accelerate its fusion propulsion technology projects.

UK-based start-up Pulsar Fusion is also attempting to develop the technology and has started construction on a large nuclear fusion chamber in England.

When the engine is fired, it would, at least temporarily, be the hottest place in the solar system.

China is also trying to advance the development of nuclear fusion, with reports of a new state-owned company that would help accelerate the production of an "artificial Sun".

Is there an Earth-like planet beyond the solar system?

One of the reasons scientists want to explore interstellar space is to learn more about the universe and possibilities of life beyond Earth.

Nasa has been studying exoplanets, or planets outside of the solar system, for decades by using telescopes.

Mr Johnson said he "doubts we will find Earth 2.0 anywhere close" and that discovering another home-like planet was not thought to be a near-term possibility.

"Over time, we might be able to modify another planet to make it habitable but that will likely take additional centuries or millennia," he said.

"That doesn’t mean we shouldn’t go. The job of science is to learn more about the universe in which we live.

"Studying planets around other stars will help us better understand our own solar system and expand our knowledge of this big universe. That alone, in my opinion, makes the journey one we should make."

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

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Daniel Oberhaus

Gravity, Gizmos, and a Grand Theory of Interstellar Travel

It was a warm afternoon in July, and Hal Fearn was sitting in his camouflage jeep in the parking lot of a mostly empty IHOP in Southern California. Fearn, a physicist at California State University, Fullerton, bided his time by singing along to the a cappella covers pumping through his stereo. He hadn’t loitered long before he spotted a silver minivan easing into the lot. Behind the wheel was Jim Woodward, large gold-framed glasses and a surgical mask adorning his gaunt face.

Woodward, a physics professor emeritus at Fullerton, slid his van beside the jeep and rolled down his window to pass a box to Fearn. Inside was a collection of metallic devices with wires protruding from their exposed electromechanical guts. They looked like the type of gadgets an action movie villain might carry in his pocket to blow up a city, but their actual function is even more improbable. Woodward believes these devices—he calls them his “gizmos”—may set humans on the path to interstellar travel .

As the pandemic raged across the globe, Woodward and Fearn met regularly in the pancake house parking lot to keep their experiments going. Funded by a grant from a NASA program that also supports research on far-out concepts such as inflatable telescopes and exoplanet photography , the duo has been developing what they call a Mach-effect gravitational assist (MEGA) drive, a propulsion system designed to produce thrust without propellant.

Every spacecraft that has ever left Earth has relied on some type of propellant to get it to its destination. Typically a spacecraft moves by igniting its fuel in a combustion chamber and expelling hot gases. (Even more exotic forms of propulsion, such as ion thrusters, still require propellant.) That’s why humans have remained stuck so close to home . A spacecraft can only accelerate as long as it has fuel to burn or a planet to loop around for a gravitational assist. Those methods can’t even carry a vehicle all the way to Alpha Centauri, our closest neighbor, in any reasonable amount of time. The fastest spacecraft ever built, the Parker Solar Probe, which will hit speeds over 400,000 miles per hour, would take thousands of years to get there.

Woodward’s MEGA drive is different. Instead of propellant, it relies on electricity, which in space would come from solar panels or a nuclear reactor. His insight was to use a stack of piezoelectric crystals and some controversial—but he believes plausible—physics to generate thrust. The stack of crystals, which store tiny amounts of energy, vibrates tens of thousands of times per second when zapped with electric current. Some of the vibrational frequencies harmonize as they roll through the device, and when the oscillations sync up in just the right way, the small drive lurches forward.

This might not sound like the secret to interstellar travel, but if that small lurch can be sustained, a spacecraft could theoretically produce thrust for as long as it had electric power. It wouldn’t accelerate quickly, but it could accelerate for a long time, gradually gaining in velocity until it was whipping its way across the galaxy. An onboard nuclear reactor could supply it with electric power for decades, long enough for an array of MEGA drives to reach velocities approaching the speed of light. If Woodward’s device works, it’d be the first propulsion system that could conceivably reach another solar system within the lifespan of an astronaut. How does it work? Ask Woodward and he’ll tell you his gizmo has merely tapped into the fabric of the universe and hitched a ride on gravity itself.

Sound impossible? A lot of theoretical physicists think so too. In fact, Woodward is certain most theoretical physicists think his propellantless thruster is nonsense. But in June, after two decades of halting progress, Woodward and Fearn made a minor change to the configuration of the thruster. Suddenly, the MEGA drive leapt to life. For the first time, Woodward seemed to have undeniable evidence that his impossible engine really worked. Then the pandemic hit.

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Woodward turns 80 next year. He is a survivor of stage IV lung cancer living with COPD, and he is being treated for relapsed Hodgkin's lymphoma. That puts him in the high-risk category for Covid-19, so when cases in California started climbing, he grudgingly left his lab at Fullerton and hunkered down at home. But he wasn’t going to let a global pandemic stymie his progress.

Over the summer, Woodward gradually turned the office he shares with his partner, Carole, into a den that would be the envy of any mad scientist. Hand tools are scattered around Woodward’s desk among boxes full of new ball bearings, stacks of crystalline disks, and scraps of metal shim that Woodward has cut into electrodes. There’s lubricant that costs $175 a bottle, for greasing the bearing rods, and a special glue that has a number for a name. It’s a stark contrast to Carole’s neat desk on the other side of the room, but Woodward says she’s so far tolerated his ad hoc thruster factory. “I should think that having a partner like me would be very trying,” he says. “She has been astonishingly good about it over the years.”

Woodward and Fearn film and record the displacement registered by the torsion balance from every test of their Mach-effect thruster.

Woodward built a dozen or so devices and handed some of them off to Fearn, who tested them in their shared lab at Fullerton. Later this fall, they’ll send a device to an independent researcher in Toronto named George Hathaway, an experimentalist with ties to NASA whom Woodward described as “probably the finest experimentalist in the world for this type of work.” Woodward prepared another thruster for the US Naval Research Laboratory, which will also try to replicate the duo’s results.

The amount of thrust Woodward appears to have coaxed out of his MEGA drive is tiny even compared to the puniest satellite thrusters in orbit today. But if other engineers can confirm his results, it could be our best bet yet for a human mission to the stars.

Scientists have long dreamed of seeing an alien sunrise. Our sun is just an average star, one of billions like it in our galaxy. Many of those stars also have planets, some of which might have the right conditions to support life. In 1911 the Russian scientist Konstantin Tsiolkovsky, generally regarded as the father of rocket science, was the first to outline how an interstellar spacecraft might go about exploring them. Since then, scientists have proposed using fusion engines, wormholes, massive lasers, and hydrogen bombs to whisk humans across the deepest of deep space.

Only two spacecraft—Voyager 1 and Voyager 2—have ever entered interstellar space. Like every spacecraft to date, they were hurled into the void by a rocket and then used small liquid-fueled thrusters to navigate the solar system. They’re now booking it through the cosmos at more than 35,000 miles per hour. NASA has contemplated an uncrewed interstellar mission for years, but the only one under active development today is an independent effort called Breakthrough Starshot. It aims to use exceptionally powerful lasers to propel a spacecraft the size of a fingernail up to 20 percent the speed of light . For humans to make the trip, they’d need a much larger craft—and a propulsion system that, ideally, could get them there within a generation. That species-defining challenge was what captivated Woodward as a young man.

Woodward was born in Boston in 1941, the eldest son of a patent lawyer and an astronomer. His mother, the astronomer, gave him a basic fluency in the language of the universe and stoked his curiosity about the cosmos. As a child, Woodward tinkered with homemade rockets, but he didn’t get very far. His younger brother, Paul Woodward, an astrophysicist at the University of Minnesota, recalls a time when his older brother pilfered potassium nitrate from his childhood chemistry set and used it to make a homebrew rocket that exploded spectacularly over their neighborhood.

“The story was that my father got on some sort of list for doing that and could not buy me any more chemicals for my experiments,” Paul recalls. “So the launch was the end of Jim's career in rocketry and my career as a chemist.” Still, Woodward followed his childhood interest into a physics undergraduate program at Middlebury College, a small liberal arts school in Vermont. But it was an experience he had a few years after graduating that changed the course of his life.

Woodward has been developing his Mach-effect thrusters for nearly 30 years.

On a clear night in March 1967, Woodward was stargazing on the rooftop of Pensión Santa Cruz, a hotel in the heart of Seville, in Spain. The 26-year-old physicist was struggling with his chosen profession and had taken a break from graduate work at New York University. He found himself drawn to fringe research topics, particularly those having to do with gravity, which he knew would make it hard to get a job. “It became clear to me simply by looking at the physics department around me that a bunch of people like that were unlikely to hire someone like me,” Woodward says. So he decided to try something else. He had picked up flamenco guitar as an undergrad and even performed in clubs in New York. Inspired by his aunt, a CIA officer who had learned to play the instrument while stationed in Madrid, he headed to Spain to pursue a career in it.

At the time, the space race was only a decade old and satellite spotting was a popular sport. As Woodward gazed up from atop his Spanish hotel, he saw a speck of light arcing across the sky and mentally calculated its path. But as he watched the satellite, it began deviating from its expected trajectory—first by a little and then by a lot.

Everything Woodward knew about satellites told him that what he was seeing should be impossible. It would take too much energy for a satellite to change its orbit like that, and most satellites weren’t able to shift more than a couple of degrees. And yet, he had just seen a satellite double back with his own eyes. He didn't conclude that engineers at NASA or in the Soviet Union must have secretly achieved a breakthrough in satellite propulsion. Instead, he believes he saw a spacecraft of extraterrestrial origin. “Critters at least as clever as us had figured out how to get around spacetime far better than we are capable of doing,” Woodward says. That changed the question, he says, from if it was possible to how.

Never one to doubt the power of the human intellect, especially his own, Woodward reckoned he could build a similar interstellar propulsion system if he put his mind to it. “If somebody figured out how the hell to do something like that, they probably aren’t an awful lot smarter than I am,” Woodward recalls thinking at the time. “So I thought maybe I should devote a little time to trying to do that.” It was a project that would occupy him for the rest of his life.

Woodward completed his master’s degree in physics at NYU in 1969, and he left to do a PhD in history at the University of Denver shortly after. His decision to pivot from physics to history was a pragmatic one. As a master’s student, he spent a lot of his time combing through old scientific journals in search of promising gravitational research that had been abandoned or hit a dead end so he could pick up the torch. “I was doing the history of science already, so I might as well get a degree in it,” Woodward says. “It was an obvious thing to do.” As an academic historian, he’d enjoy the job security that comes with uncontroversial research and still have the freedom to study fringe gravitational topics as an avocation. He accepted a position in the Cal State Fullerton history department in 1972.

It’s not like Woodward’s passion for fringe physics was a secret. In addition to a trickle of historical research, he regularly published technical papers in mainstream science journals on arcane gravitational subjects. “It is unusual that a professor of history would set up a research lab in physics, but Jim was recognized as a serious scholar and committed researcher,” says Dorothy Woolum, a physicist who arrived at Fullerton shortly after Woodward. He was particularly interested in using pulsars, a type of rapidly spinning neutron star that had only recently been discovered, to try to detect an unknown and exotic coupling between electromagnetism and gravity predicted by the Nobel Prize–winning physicist Patrick Blackett. Alas, Woodward’s work on pulsars only managed to raise skepticism among his peers. “Many people looked at me as a crank and blew me off,” Woodward says. “I wouldn’t recommend it as a career path.”

The electromagnetism stuff was bad enough, but it was Woodward’s emerging ideas about inertia that really got them riled up. Inertia is the resistance you feel whenever you push on an object. (Or, as Newton put it, inertia is why an object at rest tends to stay at rest.) Though ubiquitous and fundamental, no one has penned a full explanation of it. Woodward inherits his ideas about inertia from Einstein, who was inspired by the 19th-century physicist Ernst Mach. Mach posited that inertia is the result of the gravitational interactions of everything in the universe. In other words, the resistance from the sidewalk when someone walks on it or from a pool wall when a swimmer executes a tumble turn is partly due to starstuff billions of light years away. Einstein called this idea “Mach’s principle” and incorporated it into general relativity, his theory of gravity.

From the start, Mach’s principle was a controversial addendum to general relativity. Some of Einstein’s contemporaries, especially the Dutch mathematician Willem de Sitter, labored to show that his concept of inertia was inconsistent with other mathematical implications of general relativity. But it was the physicist Carl Brans who finally expelled the idea from respectable physics. In Brans’ PhD thesis , published in 1961, he used mathematics to demonstrate that inertia could not be explained by the gravitational influence of distant matter in the universe. After Brans’ paper, “everybody assumed that inertia à la Einstein was not contained in general relativity,” Woodward says. “That’s still the view of most general relativists.”

But as Woodward dug deeper into the history and science of general relativity, he couldn’t shake the feeling that Brans had gotten it all wrong. And as he discovered in the autumn of 1989, if you accepted Einstein’s view that inertia was inextricably linked to gravity, it opened up the possibility for propellantless propulsion.

Woodward’s views on gravity and inertia aren’t mainstream, but it’s not crazy to think Einstein might have been right all along. “I'm pretty comfortable with Jim's take on it, because it's very historically oriented,” says Daniel Kennefick, an astrophysicist and historian of science at the University of Arkansas, who has collaborated with Woodward. “He is very much motivated by Einstein's understanding of Mach’s principle. It's not at all unusual for an idea to be discovered, rejected, and then later make a comeback.”

In Einstein’s famous equation, E = mc 2 , an object’s energy, E , is equal to its mass, m , multiplied by the speed of light squared. That means if you change an object’s energy, you will also change its mass. An object’s mass is a measure of its inertia—that’s why it takes greater force to push a more massive object than a less massive one—so changing its energy will also change its inertia. And if, per Mach’s principle, inertia and gravity are one and the same, then changing an object’s energy means messing with the very fabric of spacetime. In theory, anyway.

Woodward realized that if Einstein was right and inertia really is gravity in disguise, it should be possible to detect these brief changes in an object’s mass as its energy fluctuates. If part of an object accelerated at the exact moment when it became a little heavier, it would pull the rest of the object along with it. In other words, it would create thrust without propellant.

Woodward called these temporary changes in mass “Mach effects,” and the engine that could use them a Mach-effect thruster. By combining hundreds or thousands of these drives, they could conceivably produce enough thrust to send a spaceship to the stars in less than a human lifetime. How to keep a person alive in space for decades is still an enormous question. But it is a mere footnote to the more fundamental issue of figuring out how to cross a void trillions of miles wide in any reasonable amount of time.

By 1995, Woodward’s ideas about Mach effects had coalesced into a full theory, and he turned his attention to building a thruster to prove it. The design he settled on was simple and opportunistic. A local electronics manufacturer was relocating, and an employee had alerted the university it had some leftover materials on offer. Woodward swung by its old office and snapped up a pile of piezoelectric disks the company had left behind.

To build his interstellar engine, Woodward mounted the piezoelectric disks to a block of brass and put a cap on the other end to hold it all in place. When piezoelectric disks are hit with a pulse of electricity, they bulge slightly. This expansion causes them to push off of the brass block and accelerate in the opposite direction. According to Woodward’s theory of Mach effects, the electric current would also make the piezoelectric disks ever-so-slightly heavier. This causes them to pull the brass block toward them. When the electricity stops flowing, the whole ensemble will have scooted slightly forward. By repeating this process over and over, Woodward figured, the Mach-effect thruster should accelerate. Fearn, his closest collaborator, compares it to rowing a boat on the ocean of spacetime.

Over the next few years, he managed to coax a few hundred nanonewtons of thrust out of his Mach-effect drive. Most of Woodward’s peers dismissed his nearly imperceptible results as a measurement error. It is not hard to see why—when you blow out candles on a birthday cake, you produce around three orders of magnitude more force than what Woodward was reporting. Even if the device did work, it wouldn’t be enough to move a small satellite, much less a starship.

Nevertheless, Woodward’s Mach-effect thrusters attracted the attention of researchers in government and industry. In 1997 he gave a presentation on his work at Lockheed Martin, and a few months later officials from the Department of Energy and Sandia National Laboratories paid a visit to his lab. But funding never materialized. So he pressed forward on his own, assisted by his graduate student Tom Mahood and a handful of other collaborators. Then he found out about the cancer.

In 2005, doctors found a 2-inch tumor in Woodward’s left lung. The cancer had spread to his lymphatic system, causing the left part of his face and neck to swell. His prognosis was bleak. His doctors told him his odds of surviving the year were 1 in 3; the odds that he’d live five years were 1 in 100. He enrolled in a few clinical trials to try experimental therapies and had extraordinary results. Within months, the cancerous mass in his lungs had virtually disappeared. The treatments came with complications—Woodward experienced heart failure and lost the ability to walk without a pair of canes—but he survived.

Woodward beat stage IV lung cancer, but the therapies left him unable to walk without two canes.

Woodward’s favorite Einstein quote is “Coincidence is God’s way of remaining anonymous,” and his cancer ordeal only reinforced his belief in its fundamental truth. “There was just one coincidence after another,” Woodward says. “By all rights, I should have been dead and gone 15 years ago.”

Reckoning with his mortality only strengthened his resolve. On the days when he wasn’t in a doctor’s office, he was in the lab trying to breathe life into his machines. Then a twist of fate led him to team up with Fearn. For 20 years Woodward had had an expansive lab in the physics department, but Cal State Fullerton now needed the space to open a new Center for Gravitational-Wave Physics and Astronomy. “If it had been anything other than gravitational physics, I probably would have resisted,” Woodward says. “But since it was gravitational physics, I was delighted to move.”

Woodward found some space in an empty back office that technically belonged to Fearn, who was on sabbatical. When Fearn returned, he discovered he was now roommates with the university’s most eccentric scientist. “I was really pissed off, because everything was a jumbled mess with these big computers stacked on top of each other, and all my books had been shoved into my room,” Fearn recalls. “And here's this strange guy in my back room doing these weird experiments.”

At first, Fearn took only a casual interest in Woodward’s experiments. But as time passed, he couldn’t help noticing his roommate’s results were improving. “That’s when I started to get interested and talk to him about what he was doing,” he says.

Soon, he was hooked. He offered to help, and the duo quickly became inseparable, a professional relationship that’s part The Odd Couple , part Watson and Crick. Although he didn’t fully buy into Woodward’s theoretical explanation for his Mach-effect thrusters, Fearn couldn’t resist the challenge. “How many people can say they’re trying to build a propulsion system to send spaceships to the stars?” Fearn says. “That’s what we’re doing here.”

Woodward and Fearn have collaborated on the Mach-effect thruster for a decade.

The advanced propulsion community is a small one. Perhaps a few dozen physicists and engineers around the world are working on problems such as fusion-powered rockets and faster-than-light travel. Everybody knows everybody, and as in any small community, there’s infighting and gossip. But there’s also a deep bond that comes with having to convince the rest of the scientific establishment that you’re not that crazy. “People will get into shouting matches,” says Greg Meholic, an engineer at the Aerospace Corporation working on advanced propulsion. “But then, when the workday is done or there's a break, everybody's friends.”

Meholic says he first met Woodward at an advanced propulsion conference in the ’90s. “The self-skepticism he had at the time was very appealing,” says Meholic. “He didn't ever make the claim that he had the revolutionary thing and we’re going to be flying to the stars in 10 years.” After one of Woodward’s presentations, Meholic offered his engineering perspective on his thruster designs, and they’ve been friends and collaborators ever since. So in 2016, when Meholic heard that Woodward and Fearn had teamed up with the Space Studies Institute, a nonprofit founded by the physicist Gerard O’Neill, to start a conference for advanced propulsion, he knew he had to be there. “Everybody who's ever done any research at all in this kind of work was invited to come,” he says.

The workshop was held that September in Estes Park, Colorado. It was good timing. Shortly before the conference began, a research paper leaked on an online space forum that purported to show the first strong results from experiments on another approach to propellantless propulsion, called the EmDrive. Designed by a NASA research group led by physicist Sonny White , the EmDrive was supposed to produce thrust by essentially bouncing microwaves around a closed, conical cavity. It’s the closest thing Woodward’s thrusters have to a rival.

Woodward and Fearn also had exciting results to share. Their Mach-effect thruster appeared to be producing a few micronewtons of thrust, a record for the device. Even better, three other researchers who had tried out a Mach-effect thruster in their own labs confirmed they had seen it produce thrust, though not as much as Woodward and Fearn saw.

The work was enough to earn Woodward and Fearn a coveted spot in NASA’s Innovative Advanced Concepts program. In 2017 the duo secured a $125,000 grant from the space agency. It was the first funding Woodward had ever received to work on his device. Over the years, he had poured about $200,000 of his own money into building the thrusters. “Jim is a master of doing amazing things with next to nothing,” says Mahood, his former graduate student who helped him design and build many of the early devices.

As part of the NASA grant, Woodward and Fearn were tasked with both boosting the performance of their thrusters and finding a way to put them to practical use. So they collaborated with the physicist Marshall Eubanks, an expert on interstellar mission concepts , to design an uncrewed spacecraft that could reach a nearby star system.

Their design, called the SSI Lambda in homage to the Space Studies Institute, is an alien-looking craft that consists of a long triangular truss flanked by three heat radiators that protrude from its body like feathers on an arrow. An array of roughly 1,500 scaled-up MEGA drives situated around its middle provide thrust. A small modular nuclear reactor would power the thrusters.

“The SSI Lambda probe using MEGA drive thrusters is a truly propellantless-propulsion spacecraft,” the team wrote of the design in its report to NASA. “It can travel at speeds up to the speed of light in a vacuum with only consumption of electric power. No other method for travelling to the stars and braking into the target system has been put forward to date, which also has credible physics to back it up.”

In 2018, NASA awarded Woodward and Fearn a larger grant worth $500,000. But that welcome development coincided with some bad news from Germany: Martin Tajmar, a physicist at the Dresden University of Technology who had earlier replicated Woodward’s work, had tried again and this time failed to detect thrust. Woodward counters that Tajmar was missing a critical piece of equipment. Tajmar isn’t convinced. “I always had the suspicion that the thrust could be some thermal or vibration artifact,” says Tajmar. “My conclusion after many years is that it’s just vibration.”

In early 2019, Fearn flew to Germany to deliver another thruster to Tajmar. He stayed long enough to help Tajmar and his team set up the thruster and run some preliminary tests. Although these tests registered thrust, they were much smaller than what Woodward and Fearn had detected in their own lab. Tajmar visited Woodward and Fearn in California later that summer with more bad news. After Fearn had left, he’d run more tests in different configurations and again failed to detect thrust. “We tested it in his original configuration and we tested it by changing their mounting,” Tajmar says. “You can easily change your vibration artifacts by introducing some rubber or changing a screw, and that's exactly what Jim Woodward is doing now.”

But while investigating Tajmar’s results, Woodward discovered Fearn had made a miscalculation that caused the thrust to appear several times larger than it really was. He took it in stride. “Everybody makes mistakes,” says Woodward. Although it explained the discrepancy between their results and what Tajmar saw in his lab, it also made their promise to NASA—to reliably produce tens of micronewtons of thrust by the end of the grant—seem downright impossible.

They spent the next six months struggling to get their device to put out more thrust. Then last spring, Woodward realized the way they had mounted the thruster was damping the harmonized vibrations that are the key to producing thrust. So he built a new kind of mount that positions the stack of piezoelectric disks in the center of two rods riding on ball bushings.

The results were apparent immediately. The MEGA drive started regularly producing tens of micronewtons of thrust and before long it was producing more than 100 micronewtons, orders of magnitude larger than anything Woodward had ever built before. “I never thought I would see the day that I would be saying this to anyone,” Woodward says. “I figured we'd still be struggling along in the 1- to 5-micronewton range.” For the first time, the pair could see the MEGA thruster lurch forward with their own eyes. Sure, it was only scooting a half millimeter, but at least it was visible.

Seeing may be believing, but Woodward and Fearn both say they reacted to their results with more suspicion than jubilance. “I was shocked at the huge increase in measured force,” says Fearn. He initially thought that the movement might be due to the device’s balance recalibrating, but he says that doesn’t explain how the device is generating enough force to overcome the friction in the ball bearings so that it could move forward. Woodward is also suspicious, although less than Fearn. The movement is what his theory predicts, after all.

“I am confident that a real force is present, but I sometimes wonder if it isn’t accompanied by a spurious part,” says Woodward. Whence the suspicion? “Just years of tracking down false positives, I guess,” he says.

With ample new data in hand, they’re now focused on getting their device into the hands of other researchers so they can independently replicate their results. Mike McDonald, an aerospace engineer at the Naval Research Laboratory in Maryland, will be among the first to do so. He leads an internal program for independently testing advanced propulsion systems, which has previously shot down promising results from the EmDrive. Like any good experimentalist , he’s skeptical—but it’s an optimistic sort of skepticism. “I'd say there's between a 1-in-10 and 1-in-10,000,000 chance that it’s real, and probably toward the higher end of that spectrum,” says McDonald. “But imagine that one chance; that would be amazing. That's why we do high-risk, high-reward work. That’s why we do science.”

McDonald is waiting for his lab to resume normal operation next year, once the pandemic eases, to begin testing. He says the first step will involve simply replicating Woodward’s experiments and seeing if he observes the same signal. Then he’ll begin weeding out possible sources of false positives, such as vibration or the thermal expansion of components. One test will be to let the device run at its resonant vibrational frequency for minutes or hours at a time. If the signal persists, there’s a good chance it’s legit.

There’s a problem, though: No one is sure what the right vibration frequency is for the device. When Woodward and Fearn conduct their tests, they cycle through a broad spectrum of frequencies, and it’s only when they pass a resonant frequency that they detect thrust. But that resonant frequency constantly shifts as the device heats up. It also varies with the experimental setup. One of their collaborators, the engineer Chip Akins, is building a custom amplifier that will track the resonant frequency as it changes. So rather than producing a split second of thrust as Woodward and Fearn cycle through the frequencies, the MEGA drive will, in theory, be able to produce a sustained thrust.

If McDonald and other researchers are able to replicate Woodward and Fearn’s results, the next big step would be an in-space demonstration of the device. He and Fearn hope to have a flight-ready version of the thruster finished within a year. If an in-space demonstration on a small satellite around Earth goes well, more ambitious missions might await. “Do I feel vindicated? No, not really,” Woodward says. “I’ll feel vindicated if I live long enough to see someone publicly say, ‘Yes, these things really work.’”

But even if the community accepts that the thrusters work, that doesn’t mean they’ll accept Woodward’s explanation of why they work. “In my opinion there is no merit to Woodward's theory,” says Mike McCulloch, a physicist at the University of Plymouth who has advanced an alternate idea called quantised inertia that he purports can also explain some of Woodward’s results. “I think the experimental results are more interesting than the theory.” Even Fearn, Woodward’s closest collaborator, has his doubts. But he also doesn’t have any other way to explain what he and Woodward are seeing in the lab. “I haven't been able to disprove it, and believe me, I've been trying to disprove it for the last 10 years,” he says.

Woodward’s at peace with his critics. If what he’s seeing is real—if his MEGA drive really produces thrust—he is convinced that his theory is the only one that can explain it.“That’ll sort itself out eventually,” he says.

But if he was once a skeptic’s skeptic, Woodward now seems almost religious in his faith that what he’s seeing is real. Some of his supporters can’t help but wonder if it’s led him astray. “As time has gone on, Jim has gotten much more staunch in his approach,” says Meholic. “He's literally come out and said at some point that the textbooks are wrong and I'm right.”

If it all turns out to be an illusion and Woodward has spent his life chasing vibrations, his colleagues are the first to admit it wasn’t for nothing. “There is a worldwide effort looking at Jim’s devices, because this is really the only game in town at this point,” says Meholic. “It's been wonderful to have someone like him in the community that actually is doing something to advance these things, because that’s what’s really critical."

Whether you think Woodward is a lunatic or a visionary is mostly a matter of your perspective on gravity. A kiss on the cheek or a shot from a gun or a vibration in a stack of piezoelectric crystals either implicates a galaxy billions of light years away, or it doesn’t. The experimental data won’t lie, but if Woodward hasn’t discovered the interstellar engine we’ve been waiting for, he’s kept the dream alive for the next generation of would-be star surfers who might.

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The voyage to interstellar space.

Susannah Darling

Katy Mersmann

The magnetometer, the cosmic ray subsystem, the plasma instrument.

By all means, Voyager 1 and Voyager 2 shouldn’t even be here. Now in interstellar space, they are pushing the limits of spacecraft and exploration, journeying through the cosmic neighborhood, giving us our first direct look into the space beyond our star.

But when they launched in 1977, Voyager 1 and Voyager 2 had a different mission: to explore the outer solar system and gather observations directly at the source, from outer planets we had only seen with remote studies. But now, four decades after launch, they’ve journeyed farther than any other spacecraft from Earth; into the cold, quiet world of interstellar space.

Originally designed to measure the properties of the giant planets, the instruments on both spacecraft have spent the past few decades painting a picture of the propagation of solar events from our Sun. And the Voyagers’ new mission focuses not only on effects on space from within our heliosphere — the giant bubble around the Sun filled up by the constant outflow of solar particles called the solar wind — but from outside of it. Though they once helped us look closer at the planets and their relationship to the Sun, they now give us clues about the nature of interstellar space as the spacecraft continue their journey.

The environment they explore is colder, subtler and more tenuous than ever before, and yet the Voyagers continue on, exploring and measuring the interstellar medium, a smorgasbord of gas, plasma and particles from stars and gas regions not originating from our system. Three of the spacecraft’s 10 instruments are the major players that study how space inside the heliosphere differs from interstellar space. Looking at this data together allows scientist to piece together our best-yet picture of the edge of the heliosphere and the interstellar medium. Here are the stories they tell.

On the Sun Spot , we have been exploring the various instruments on Voyager 2 one at a time, and analyzing how scientists read the individual sets of data sent to Earth from the far-reaching spacecraft. But one instrument we have not yet talked about is Voyager 2’s Magnetometer, or MAG for short.

During the Voyagers’ first planetary mission, the MAG was designed to investigate the magnetospheres of planets and their moons, determining the physical mechanics and processes of the interactions of those magnetic fields and the solar wind. After that mission ended, the Voyager spacecraft studied the magnetic field of the heliosphere and beyond, observing the magnetic reach of the Sun and the changes that occur within that reach during solar activity.

Getting the magnetic data as we travel further into space requires an interesting trick. Voyager spins itself around, in a calibration maneuver that allows Voyager to differentiate between the spacecraft’s own magnetic field — that goes along for the ride as it spins — and the magnetic fields of the space it’s traveling through.

The initial peek into the magnetic field beyond the Sun’s influence happened when Voyager 1 crossed the heliopause in 2012. Scientists saw that within the heliosphere, the strength of the magnetic field was quite variable, changing and jumping as Voyager 1 moved through the heliosphere. These changes are due to solar activity. But once Voyager 1 crossed into interstellar space, that variability was silenced. Although the strength of the field was similar to what it was inside the heliosphere, it no longer had the variability associated with the Sun’s outbursts.

This graph shows the magnitude, or the strength, of the magnetic field around the heliopause from January 2012 out to May 2014. Before encountering the heliopause, marked by the orange line, the magnetic strength fluctuates quite a bit. After a bumpy ride through the heliopause in 2012, the magnetic strength stops fluctuating and begins to stabilize in 2013, once the spacecraft is far enough out into the interstellar medium.

In November 2018, Voyager 2 also crossed the heliopause and similarly experienced quite the bumpy ride out of the heliopause. Scientists are excited to see how its journey differs from its twin spacecraft.

Scientists are still working through the MAG data from Voyager 2, and are excited to see how Voyager 2’s journey differed from Voyager 1.

Much like the MAG, the Cosmic Ray Subsystem — called CRS — was originally designed to measure planetary systems. The CRS focused on the compositions of energetic particles in the magnetospheres of Jupiter, Saturn, Uranus and Neptune. Scientists used it to study the charged particles within the solar system and their distribution between the planets. Since it passed the planets, however, the CRS has been studying the heliosphere’s charged particles and — now — the particles in the interstellar medium. 

The CRS measures the count rate, or how many particles detected per second. It does this by using two telescopes: the High Energy Telescope, which measures high energy particles (70MeV) identifiable as interstellar particles, and the Low Energy Telescope, which measures low-energy particles (5MeV) that originate from our Sun. You can think of these particles like a bowling ball hitting a bowling pin versus a bullet hitting the same pin — both will make a measurable impact on the detector, but they’re moving at vastly different speeds. By measuring the amounts of the two kinds of particles, Voyager can provide a sense of the space environment it’s traveling through.

These graphs show the count rate — how many particles per second are interacting with the CRS on average each day — of the galactic ray particles measured by the High Energy Telescope (top graph) and the heliospheric particles measured by the Low Energy Telescope (bottom graph). The line in red shows the data from Voyager 1, time shifted forward 6.32 years from 2012 to match up with the data from Voyager around November 2018, shown in blue.

CRS data from Voyager 2 on Nov. 5, 2018, showed the interstellar particle count rate of the High Energy Telescope increasing to count rates similar to what Voyager 1 saw then leveling out. Similarly, the Low Energy Telescope shows a severe decrease in heliospheric originating particles. This was a key indication that Voyager 2 had moved into interstellar space. Scientists can keep watching these counts to see if the composition of interstellar space particles changes along the journey.

The Plasma Science instrument, or PLS, was made to measure plasma and ionized particles around the outer planets and to measure the solar wind’s influence on those planets. The PLS is made up of four Faraday cups, an instrument that measures the plasma as it passes through the cups and calculates the plasma’s speed, direction and density.

The plasma instrument on Voyager 1 was damaged during a fly-by of Saturn and had to be shut off long before Voyager 1 exited the heliosphere, making it unable to measure the interstellar medium’s plasma properties. With Voyager 2’s crossing, scientists will get the first-ever plasma measurements of the interstellar medium.

Scientists predicted that interstellar plasma measured by Voyager 2 would be higher in density but lower in temperature and speed than plasma inside the heliosphere. And in November 2018, the instrument saw just that for the first time. This suggests that the plasma in this region is getting colder and slower, and, like cars slowing down on a freeway, is beginning to pile up around the heliopause and into the interstellar medium.

And now, thanks to Voyager 2’s PLS, we have a never-before-seen perspective on our heliosphere: The plasma velocity from Earth to the heliopause.

These three graphs tell an amazing story, summarizing a journey of 42 years in one plot. The top section of this graph shows the plasma velocity, how fast the plasma across the heliosphere is moving, against the distance out from Earth. The distance is in astronomical units; one astronomical unit is the average distance between the Sun and Earth, about 93 million miles. For context, Saturn is 10 AU from Earth, while Pluto is about 40 AU away.

The heliopause crossing happened at 120 AU, when the velocity of plasma coming out from the Sun drops to zero (seen on the top graph), and the outward flow of the plasma is diverted — seen in the increase in the two bottom graphs, which show the upwards and downward speeds (the normal velocity, middle graph) and the sideways speed of the solar wind (the tangential velocity, bottom graph) of the solar wind plasma, respectively. This means as the solar wind begins to interact with the interstellar medium, it is pushed out and away, like a wave hitting the side of a cliff.  

Looking at each instrument in isolation, however, does not tell the full story of what interstellar space at the heliopause looks like. Together, these instruments tell a story of the transition from the turbulent, active space within our Sun’s influence to the relatively calm waters on the edge of interstellar space.

The MAG shows that the magnetic field strength decreases sharply in the interstellar medium. The CRS data shows an increase in interstellar cosmic rays, and a decrease in heliospheric particles. And finally, the PLS shows that there’s no longer any detectable solar wind.

Now that the Voyagers are outside of the heliosphere, their new perspective will provide new information about the formation and state of our Sun and how it interacts with interstellar space, along with insight into how other stars interact with the interstellar medium.

Voyager 1 and Voyager 2 are providing our first look at the space we would have to pass through if humanity ever were to travel beyond our home star — a glimpse of our neighborhood in space.  

Related links:

• Video: “NASA Science Live: Going Interstellar”
• Explore Voyager 2 data on “The Sun Spot” blog

By  Susannah Darling NASA’s Goddard Space Flight Center , Greenbelt, Md.

Everything you need to know about space tourism

Posted: October 12, 2023 | Last updated: October 12, 2023

Between floating in weightlessness, witnessing 16 sunrises a day and gazing into the infinite void, space travel sure sounds like an out-of-this-world experience. And now, it’s no longer a thing of the future.

That’s right, soon interstellar awe will be open to (almost) anyone, as billionaires Richard Branson, Jeff Bezos, and Elon Musk are pushing the space tourism industry to a higher orbit.

What is space tourism?

Well, it’s almost like regular tourism: travel for recreational and leisure purposes… but in outer space. Some organizations like the Commercial Spaceflight Federation and the Citizens in Space project prefer to use the terms “personal spaceflight” or “citizen space exploration,” though.

In a nutshell, it’s space travel for non-astronauts.

Who can travel to space?

Anyone ! Well, that is, anyone with enough money. No need to have any previous science qualifications or NASA training, especially since a trained crew will escort tourists on their galactic journey.

According to Virgin Galactic, future space tourists will be between 10 and 90 years old, and come from diverse professional and cultural backgrounds.

The only thing you need? The desire to explore the universe!

What is orbital travel?

The main difference between orbital and suborbital flights lies in the trajectory and speed of the vessels.

To go into orbit, a rocket or spaceship needs to follow a path that goes around the Earth at the very fast minimum speed of 7.7 kilometres (4.8 miles) per second, in order to keep circling and never fall back down.

It allows astronauts and travellers to stay in space for extended periods of time, hence it is for now the preferred type of flight.

What is suborbital travel?

A suborbital flight , which is what Branson and Bezos did, “just” requires enough energy to blast off to space and then naturally fall back to Earth, making a huge arc.

It requires less energy and is less costly than orbital flights, thus opening doors for relatively affordable space tourism in the future.

Passengers would experience up to six minutes of weightlessness and a grandiose view.

How do you prepare?

Although Virgin Galactic doesn’t explicitly list its physical requirements, they did say astronauts would have to pass certain medical checkups and training programs. Blue Origin, on the other hand, has said that training for suborbital trips will only take a day.

And of course, any space tourist will also have to pass a series of thorough tests to determine whether they’re fit to fly up there.

Once in space, you may have to perform small bouts of exercise to prevent muscle wasting , which takes place after just seven days.

What is lunar tourism?

As its name hints, lunar tourism is the project of sending paying travellers to the moon. The first one could happen as soon as 2023, and would consist of a loop flight.

But three types of lunar tourism could be available in the near future: circumlunar trajectory, lunar orbit, and even lunar landing.

How cool would it be to say to someone, upon returning from a lunar vacation, “I’ve literally loved you to the moon and back”?

Where does space tourism take place?

Admittedly, space is a vast place. So where exactly would tourists go ?

First, any space travel begins with the Kármán line , which lies at 100 kilometres (62 miles) above sea level and is commonly accepted as the limit between Earth’s atmosphere and outer space.

Then, there are several options: orbital, suborbital, and lunar space tourism.

Have touristic space travels already occurred?

Yes! From 2001 to 2009, the Russian space agency and the U.S.-based space tourism company Space Adventures took seven (very wealthy) members of the public for several orbital space travels to the International Space Station.

The flights took place aboard the famous spacecraft Soyuz but stopped in 2010, since the crew of actual astronauts grew bigger and left no more seats available for paying space tourists.

Who were the first space tourists?

The American businessman Dennis Tito became officially the first space tourist in April 2001, when he stayed for seven days on the International Space Station.

He was followed by six multimillionaire fellows from various countries: South African entrepreneur Mark Shuttleworth, American scientist Gregory Olsen, Iranian engineer Anousheh Ansari (the first female space tourist), Hungarian-American computer programmer Charles Simonyi, British video game mogul Richard Garriott, and Canadian businessman Guy Laliberté.

On July 11, 2021, billionaire Richard Branson, along with three Virgin Galactic employees and two pilots, reached an altitude of 85 kilometres (53 miles) above Earth aboard his Virgin Galactic rocket plane, the Unity. Less than 10 days later, on July 20, the world’s richest man, Amazon’s Jeff Bezos, briefly entered space on Blue Origin , his private space company’s reusable rocket. He was joined by his younger brother Mark, Dutch teenager Oliver Daemen, and Wally Funk, who, at 82 years old, became the oldest astronaut.

Who would be the space tourism “agencies”?

Unlike past tourism experiments, which took place aboard vessels sent off for scientific purposes, future travels will happen on private companies’ flights set up solely for space tourism.

Those pioneering aerospace companies are Richard Branson’s Virgin Galactic ; SpaceX, founded by Tesla co-founder Elon Musk ; and Blue Origin , created by Amazon founder Jeff Bezos.

When will space tourism happen?

Sooner than you think. According to Forbes , Virgin Galactic’s successful trip means the company could start sending civilians up into space as soon as early 2022. Likewise, Blue Origin, which has a Federal Aviation Administration licence for human space travel through August 2021, could officially enter the space tourism game by early 2022.

How much will it cost?

It’s not exactly clear at the moment, but there have been some indications. For example, Virgin Galactic began selling ticket reservations for US$250,000 and sold roughly 600, before a test crash in 2014 brought sales to a halt. They’re expected to start selling tickets again in 2022, but at a much higher price.

It was reported in 2018 that seats on Bezos’s Blue Origin would also cost in the ballpark of US$200,000 to US$300,000, but that could change given how high demand is. At a recent auction, the winning bid for a seat aboard the company’s first spaceflight was a whopping US$28 million .

The bottom line is, those hoping to take a trip around the stars will either need to know someone or have hundreds of thousands (likely even millions) of dollars to spare.

How do we get there?

The development of space tourism vehicles is still an ongoing project.

But a few options already exist, like Virgin Galactic’s spaceplanes that can carry up to eight people, or SpaceX’s Dragon spacecraft , launched by the Falcon Heavy rocket.

Blue Origin’s New Shepard looks more like a regular rocket that takes off and lands vertically, but also claims to offer the biggest windows of any spacecraft—a good selling point. It comfortably sits six people and is fully autonomous, meaning no pilot onboard.

What does it feel like?

Needless to say, travelling to space is no walk in the park.

You’re eager to experience the joys of floating in microgravity? You better also get prepared to endure several physical discomforts: nausea and sea sickness, dizziness, headache, disorientation, puffy face, and bloodshot eyes.

But astronauts and previous space tourists agree that the body adjusts fairly quickly, getting used to its spatial environment in about three days.

Is it safe?

Safety is a reasonable concern , considering the many hazards involved in space travel: the probability of a crash, exposure to cosmic radiation, and even unknown dangers that could emerge with this new industry. But here is the real question for any adventurer: is the thrill worth the risk?

What is the food like?

For many tourists, food is a crucial criterion for a successful vacation. But outer space is no place for gourmets, at least not yet. Interstellar tourists can expect to enjoy mostly canned, modified, and pre-packaged meals (such as space burritos and freeze-dried ice cream). But soon, thanks to NASA’s veggie farm , space tourists might be able to savour space-grown salads.

What about the accommodations?

Orbital space travel allows you to stay up there for a few days or even weeks. At that point, you might want to stretch your legs outside of the spacecraft, right? Well, in the future, space stations could be used as hotels: the Genesis inflatable habitats by Bigelow Aerospace and the Space Island Project are existing examples. Make sure to book a room with a view of planet Earth!

How to pack a space suitcase?

Packing a suitcase for a trip through the cosmos is actually less of a headache than doing so for a weekend vacation on Earth. Just keep in mind that it’s impossible to do laundry in space, so pack clothes accordingly : stock up on underwear, light clothing (space station temperature is controlled at about 22 degrees Celsius, or 72 degrees Fahrenheit), and exercise outfits. Outerwear will be provided: an orange suit for takeoff and re-entry, and a white one for potential space strolls.

Is it eco-friendly?

With ecotourism being a growing trend and concern over the last few years, the question is legitimate. Well, bad news: space travel could have a negative impact by accelerating global warming . This would be caused by the black carbon released into the stratosphere after suborbital launches. But of course, entrepreneurs in the industry claim that the carbon footprint of space tourism would be minimal. The truth is, rockets emit 50 to 100 times more CO₂ per passenger than a regular flight. Considering that Virgin Galactic plans to do 400 trips per year, that’s a lot of CO₂ entering the atmosphere.

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Time Dilation

What Is Time Dilation?

An accurate clock for one observer may be measured as ticking at a different rate when compared to a second observer’s own equally accurate clock. This effect is not a result of the clocks’ technical properties but of the nature of spacetime itself. [i] Clocks on the International Space Station (ISS), for example, run marginally more slowly than reference clocks back on Earth. This explains why astronauts on the ISS age more slowly, being 0.007 seconds behind for every six months. This is known as time dilation, and it has been frequently confirmed and validated by slight differences between atomic clocks in space and those on Earth, even though all were functioning flawlessly. The laws of nature are such that time itself will bend because of differences in either gravity or velocity, each of which affects time in distinctive ways. This phenomenon will have significant implications for interstellar or intergalactic travel.

What Causes Time Dilation?

Time dilation is triggered by disparities in both gravity and relative velocity. Together these two factors are at constant play in the case of a spacecraft’s crew. When two observers are in relatively uniform motion and not influenced by any gravitational mass, the point of view of each observer will be that the other’s clock is ticking at a slower rate than his or her own. Furthermore, the faster the relative velocity, the larger will be the magnitude of time dilation. This case is occasionally termed special relativistic time dilation.

The Spacecraft Scenario

Two spacecraft moving past each other in space would experience time dilation. If the crew inside each one could somehow have an unobstructed view into the other’s spacecraft, it would see the other craft’s clocks as ticking more slowly than its own. In other words, from Spacecraft A’s frame of reference its clocks are ticking normally, while Spacecraft B’s clocks appear to be ticking more slowly (and vice versa). From a local standpoint, time registered by clocks that are at rest with respect to the local frame of reference always seems to pass at the same rate. For example, if a new spacecraft, Spacecraft C, travels next to Spacecraft A, it is “at rest” relative to Spacecraft A. From Spacecraft A’s point of view, Spacecraft C’s time would also appear normal. Here arises a thought-provoking question. If both Spacecraft A and Spacecraft B think that each other’s clocks are ticking more slowly than the other’s, who’s time is correct, and who would have aged more?

Time Dilation and Interstellar Space Flight

Time dilation would make it conceivable for the crew of a fast-moving interstellar spacecraft to travel further into the future while aging much more slowly, because enormous speed significantly slows down the rate of on-board time’s passage. [ii] That is, the spacecraft’s clock would display less elapsed time than the clocks back on Earth. For extremely high speeds during a journey, the effect would be more dramatic. For example, one year of interstellar travel might correspond to ten years back on Earth. Therefore, constant acceleration at one G would theoretically allow a human crew to travel through the entire known universe in one lifetime. Unfortunately, the crew could return to Earth billions of years in the future. Interstellar travel at high speeds thus would have huge implications from both an anthropological and sociological perspective. The crew volunteering for a mission of this magnitude and speed would have to accept the fact that their loved ones, and perhaps even their home planet or star system, would have died long ago. [iii] Because of this effect, humans might wish to travel to nearby stars without spending their entire lives aboard an interstellar spacecraft.

The Twins Paradox

In this paradox one twin makes an interstellar trip in a fast-moving spacecraft but upon return to Earth finds that the other twin who remained there passed away hundreds or thousands of years ago. [iv] This result appears bewildering because each twin sees the other twin as traveling; therefore, each should find the other to have aged more slowly. The paradox can be resolved, however, within the framework of special relativity. The siblings are not equivalent because the twin on the interstellar trip experienced additional acceleration when switching direction to return back to Earth.

Consider by way of illustration an interstellar spacecraft traveling from Earth to Proxima Centauri, the nearest star system outside our solar system and four light years away. At a speed of 80% of the speed of light, the twins will observe the situation as described in the following paragraphs. To make the math less complicated, the spacecraft is assumed to have reached its full speed instantly upon departure from Earth.

The twin on the interstellar spacecraft would see low-frequency (red-shifted) images for three years. During that portion of the trip he would see his counterpart on Earth in the images grow older by 3/3 = 1 year. On the return trip to Earth, he then sees high-frequency (blue-shifted) images for another three years. During that time he would see his twin on Earth in the images grow older by 3 × 3 = 9 years. When the interstellar trip is completed, the image of the twin on Earth will seem to have aged by 1 + 9 = 10 years.

On the other hand, for nine years the twin back on Earth sees slow (red-shifted) images of the spacecraft twin, during which time the spacecraft twin ages in the images by 9/3 = 3 years. The twin on Earth then sees fast (blue-shifted) images for the remaining one year until the spacecraft returns. In the fast images the spacecraft twin ages by 1 × 3 = 3 years. The total aging of the spacecraft twin in the images received by Earth is 3 + 3 = 6 years, so the spacecraft twin returns a bit younger.

To avoid misunderstanding, note the difference between what each twin actually sees versus what he actually calculates. Each sees an image of his twin that he knows originated at an earlier time and that he knows is Doppler-shifted. He does not take the elapsed time in the image as the age of his twin now. If he wants to estimate when his twin was the age shown in the image, he has to determine how far away his twin was when the signal was emitted. In other words, he has to consider simultaneity for a distant event. If he wants to calculate how fast his twin was aging when the image was transmitted, he tweaks for the Doppler shift. [v]

Time Dilation and Communications with Earth

In theory, time dilation will also affect scheduled meetings between the crew on an interstellar mission and the mission managers back on Earth. For example, the crew would have to set their clocks to count the precise number of years time has passed for them, whereas mission control back on Earth would need to count several years more to allow for time dilation. At the velocities currently possible, however, time dilation is too trivial to be a factor in communications between the ISS and Earth.

Implications for Interstellar Travel

Time dilation will have huge implications for both the crew of a spacecraft and mission managers back on Earth. We must consider, for example, the age of the mission managers for the crew returning to Earth (or for alleged extraterrestrials returning to their home planets) and whether or not an interstellar mission would be sociologically accepted. Consider, for example, a spacecraft traveling at 99% of the speed of light to the center of the Milky Way. If everything goes right, the crew would have aged about 21 years. However, back on Earth over 50,000 years would have passed (as observed from Earth). [vi] Obviously all those involved in the initial planning of the mission, as well as generations thereafter, would have died long ago.

[i] Ashby, Neil (2003). “Relativity in the Global Positioning System.” Living Reviews in Relativity. http://relativity.livingreviews.org/Articles/lrr-2003-1/download/lrr-2003-1Color.pdf.

[ii] Toothman, Jessika (2012). “How Do Humans Age in Space?” HowStuffWorks. Retrieved 2012-04-24.

[iii] Calder, Nigel (2006). Magic Universe: A Grand Tour of Modern Science . Oxford University Press.

[iv] Miller, Arthur I. (1981). “Albert Einstein’s Special Theory of Relativity: Emergence (1905) and Early Interpretation (1905–1911).” SOURCE?

[v] Wheeler, J.; and Taylor, E. (1992). Spacetime Physics . 2nd ed. New York: W. H. Freeman.

[vi] Interstellar Travel Calculator. http://spacetravel.nathangeffen.webfactional.com/spacetravel.php.

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Dune: How Does Spice Make Interstellar Travel Possible?

Spice has many uses in Dune, but how exactly does it help with interstellar travel?

Denis Villeneuve’s Dune is now out and has found general acclaim alongside a lot of praise for its faithfulness to the source material. While the film doesn’t directly adapt the novel page-for-page, it does get across many of the general points and themes present in Herbert’s work. Despite how accurate much of the film appears to be , there is one section that seems to be somewhat lacking. Spice is said to be important throughout the film, it’s what kickstarts the entire plot of House Atreides moving to Arrakis, but one thing has unfortunately not been made quite clear enough. Despite the importance of Spice when it comes to interstellar travel, this relation hasn't quite been shown the weight it deserves.

The Spice on Arrakis is one of the central elements of Dune . Said to taste and smell of cinnamon, this substance sparkles among the sand particles of the desert planet. Spice has long been recognized as a stand-in for oil in the middle-east, as many of Herbert’s parallels to the real world aren’t so subtle. This substance serves many purposes in the world of Dune , and Arrakis being the sole source of it has made the planet hotly contested. Spice is said to be able to triple a man’s lifespan as well as enhance many of the abilities that various groups already have, such as the Bene Gesserit’s visions.

RELATED: Denis Villeneuve's Dune Part Two Reportedly Begins Filming July 2022

Solving The Problem Of Interstellar Travel

When it comes to interstellar travel, Spice led to a major leap forward for the people of Dune . Interstellar travel has long been possible in the Dune universe, however it hasn’t always been the safest thing. Early Interstellar travel, wherein interstellar ships fold space and time to travel across vast distances in space, was essentially done via guesswork and commitment. The technology was capable, however, the people weren’t able to plot paths far enough out to make it ultimately useful.

Since travel took so much guesswork, it often took far longer than would be ideal for armies and the like to move through space. Surprise attacks were almost impossible and armies were often able to be tracked from lightyears away . This led to many early defeats before battles were even able to begin. In addition to this, the accidental casualty rate of interstellar travelers was incredibly high. Space debris, asteroids, or nearly anything at the speeds ships traveled could lead to entire fleets being destroyed from a single jump. After Arrakis was discovered, and the Spice began being farmed, interstellar travel was revolutionized.

Space Guild Navigators

The Space Guild Navigators were implemented to help with interstellar travel. These are beings are artificially enhanced to be hyper-intelligent and have the ability to see through time. They were mutated by the guild through consumption and exposure to large amounts of spice . These beings were often left floating in tanks of refined spice, leading to large amounts of atrophy and the lengthening of their limbs. These mutations have led to many avoiding looking at the Navigators and instead simply acknowledging their usefulness.

The inhalation of spice allows the Navigators to present prescient abilities. They are able to see through time , and more specifically the future. Navigators were then used to plot safe routes through space by looking at all of the routes that would likely lead to death. The new use of Navigators from the Space Guild cut down casualties from interstellar travel by a large amount, however, it has also led to the ability for armies to employ surprise attacks on their enemies. This has greatly increased deaths from interstellar travel, however, it now came from a different source.

The Spice must flow...

Due to the usefulness of Navigators, and thus the power held by the Space Guild, Spice became very valuable to the Space Guild. Throughout Herbert's stories, the Space Guild has employed deceitful and backhanded tactics to ensure their supply of Spice, which they need quite a lot of to create more Navigators. Like everything in Dune , Spice has found a way to creep into every sector and corrupt nearly every being.

Following the implementation of Navigators, and leading up to it as well, the Space Guild held a monopoly on space travel across the known universe. This power both stems from and leads to corruption, and the guild has consistently used back channels to ensure their own power. The Space Guild often presents as a more quiet organization that prefers to silently hold its power rather than loudly present it as many of the bigger houses do. While they don't often directly involve themselves in conflict, it's likely that the Space Guild does hold the power to do so were it needed. Their far-reaching abilities and the power they hold is said to be second to only the Bene Gesserit. Many of the houses have been shown to respect the Space Guild, with some even showing it some rightfully placed fear.

MORE: John Wick Succeeds By Focusing On Characters As Much As Action

Screen Rant

Dune: how space travel works & why spice is important.

The world of Arrakis, also called Dune, is the only source of the spice melange, the key to interstellar travel and the only currency that matters.

Why is the spice important to  Dune,  and the key to its space travel? Dune is a science fiction story about warring noble houses in space; their wars, betrayals, and political maneuvering, both a grand space opera and a seminal science fiction story. Central to all conflict in  Dune  is the spice called "melange", which everyone desires. With the hype centering around Denis Villeneuve's  Dune,  those unfamiliar with the story may feel like they have to do a lot of homework about the  Dune  universe to understand it. The relationship between spice and space travel is actually pretty simple, however, although it has big implications. In understanding the spice, one understands  Dune.

Dune  began as a much-loved 1965 science fiction novel by Frank Herbert, the first book to win both the Hugo and the Nebula awards. Its success led to a series of novels that enriched and expanded the universe. The book has struggled to be adapted to screen, with many believing the  Dune book   can't be faithfully adapted  due to the sprawling world and dense story. Since Dune is a large book—its first edition was just over 400 pages—adaptation has certainly proved challenging, and what has appeared on screen has been truncated or drastically altered. Through several failed productions,  Dune  has made it to film only twice: once in 1984 under the direction of David Lynch, and once in 2021 under Denis Villeneuve, and once in miniseries format in a 2000 SyFy production. Central to all versions of the story is the spice.

Related:  Why Villeneuve's Dune Is Already Beating Blade Runner 2049's Box Office

The spice is the great McGuffin within the narrative of the Dune universe. Every character wants spice, to control the spice, or to ingest the spice. " The spice must flow " as they say repeatedly in the books, in voice-over whispers in David Lynch's  Dune , and it even manages to work its way as a mantra into Denis Villeneuve's film. Dune has a large cast of characters , but every one of their personal journeys are at least tangentially related to the spice. The key aspect of the spice is that ingesting it grants " prescience, " the ability to briefly see into the future, or rather to experience time outside the restrictions of a past-present-future framework. This is so tremendously useful to the people of the Dune universe that it influences all of the most important aspects of its setting: religion, politics, and space travel.

What Exactly Is Spice?

The spice called " melange ," or more often simply referred to as " the spice " is a dusty red substance created by monstrously large and incredibly dangerous sandworms as they burrow through the sands of their home planet of Arrakis, known colloquially as Dune. Sandworms do not live on any other planet than the desert planet Arrakis. The sandworms of Dune have animal-like intelligence, varying only slightly in appearance between adaptations, and are so tremendously large that they can rise from the ground and eat whole buildings.

Despite the danger, spice is still sought out as it's so valuable–the most important commodity in the universe due to its ability to grant longevity, vastly increase mental powers, and enable faster-than-light travel known as space folding. Therefore, the noble family House that controls Arrakis singularly controls the harvesting of spice. Likewise, Dune is the key location of the universe, with spice getting shipped across the universe from the central point of Arrakis. Beyond just its political power as a commodity, however, the spice also has practical applications within the narrative of  Dune.

What is the Spacing Guild?

Notably, all space travel is controlled by the Spacing Guild, an organization granted a monopoly on all space travel by the Padishah Emperor who rules over the noble Houses, and therefore controls the distribution of spice melange. With the prescience granted by ingesting the spice melange, the guild's skilled and highly trained Navigators are able to fold space, essentially creating wormholes to pilot their gigantic starships instantly across the galaxy. Unfortunately, the Navigators on those spacefolder ships take so much spice to achieve their navigational powers that their bodies mutate horribly into a sort of fish-like creature. It's a high price that some are nonetheless willing to pay. Without the spice, space journeys would be undergone by atomic rockets and take hundreds of years to move from planet to planet. The vast scope of the  Dune film   runs the risk of alienating audiences with so many details about the implications of spice, but, luckily, the Spacing Guild does not factor much into the story of  Dune  and its direct events. Mostly readers are told of its influence as a way of leveraging the importance of the spice.

Related:  Dune's Sequel Chances Show How Important Streaming Is Now

Who Are The Bene Gesserit?

It is easy to get lost in Dune 's overwhelming glossary  and unique terminology, but one term to know is " Bene Gesserit ," an organization of what are effectively space witches and oracles. Part religious organization and part spy and assassin guild, the women-only Bene Gesserit are martial artists, philosophers, scientists and advisors, and probably the group with the greatest influence on the narrative of  Dune.  The machinations of the Bene Gesserit are complex, but in simplest terms, they ingest spice to gain prescience, as well as other supernatural abilities, and use them for political maneuvering. To become Reverend Mothers, the Bene Gesserit also undertake a ceremony where they ingest a modified, highly toxic version of spice known as the Water of Life. Many die, but those who survive the ordeal are granted the memories of all of their female ancestors. Without the spice, they effectively lose their powers. Without their powers, the Bene Gesserit lose their advantage in the fierce political arena of the  Dune  universe.

It is a testament to Frank Herbert's craft that  Dune  can focus so intensely on one planet and one object and still feel like such a large, imposing universe. The story of  Dune   has had a drastic influence on other science fiction properties, with its magical monastic order, its noble Houses, its desert planet, and generally the complexity of its world-building. Spice is at the very center of the story and its events. Without it, spaceships do not run, magical sorceresses lose their powers, and the plot of  Dune— where, as the story begins, many of these established facts are flipped on their head—does not happen. While Denis Villeneuve's  Dune   promises to indoctrinate new fans, it all comes down to the spice melange: The spice must flow .

Next:  Dune 2 Story: What Happens Next In The Books

• International

Israel-Hamas war

Northeast earthquake

Rare 4.8 magnitude quake rattles Northeast

By Elise Hammond , Leinz Vales and Matt Meyer , CNN

Why mild East Coast earthquakes are felt over such long distances

From CNN's David Goldman

Did you feel that?

It wasn't just folks in Western New Jersey who were texting "what was that?" messages in the mid-morning Friday. People as far away as Maryland and Upstate New York reported feeling an earthquake, according to the US Geological Survey . A former CNN editor in Vermont said glasses fell off her shelf.

How is that possible, considering it was just a mild 4.8 magnitude earthquake, not enough to cause any significant damage?

The rock formations that make up America's East Coast are considerably older than those on the West Coast — hundreds of millions of years older, according to the USGS . That makes them much denser.

Imagine putting your left hand down on a piece of slate and knocking on it with your right hand. You'd feel that. That's like how the East Coast is formed.

But now imagine putting your hand down on a pebble driveway and knocking — not so much. That's the West Coast. So even though earthquakes tend to be much stronger in the western part of the country, they're not felt nearly as far away as weaker quakes in the East.

Rail service is being slowed in the Northeast due to the earthquake

From CNN's Greg Wallace and Pete Muntea

Train service is being slowed after the 4.8 magnitude earthquake that rattled the Northeast this morning.

Amtrak said started inspecting its tracks shortly after 11 a.m. ET, and put speed restrictions in place throughout the region until those inspections were complete.

New Jersey Transit said there would be up to 20-minute delays in both directions due to bridge inspections after the quake.

Newark Light Rail service was suspended system-wide, according to NJ Transit. The River Line Light Rail service, meanwhile, was suspended in both directions between the Waterfront Entertainment Center and Trenton due to track inspections.

NOW: New York governor holds news briefing on earthquake

From CNN's Samantha Beech

New York Gov. Kathy Hochul is holding a news briefing at the State Capitol following this morning’s earthquake.

New York City Mayor Eric Adams and other city administration officials will hold a separate news briefing to discuss the impacts of the earthquake at 12 p.m. ET, according to his spokesperson.

New York governor says her team is assessing any impacts from quake

From CNN staff

New York Gov. Kathy Hochul said her team will be assessing any impact and any damage that may have resulted from the earthquake that struck New Jersey on Friday.

On X , Hochul said, “A 4.8 magnitude earthquake hit west of Manhattan and has been felt throughout New York. My team is assessing impacts and any damage that may have occurred, and we will update the public throughout the day.” and any damage that may have occurred, and we will update the public throughout the day.”

Hochul will hold a press briefing soon on the earthquake at the State Capitol, according to a notification from her office.

Philadelphia police aware of reports of seismic activity and urge people not to call 911 unless of emergency

From CNN’s Danny Freeman in Philadelphia

Philadelphia Police have asked people to only call 911 if they are reporting an emergency, following Friday's 4.8 magnitude earthquake in New Jersey.

Philadelphia Gov. Josh Shapiro added in a tweet that the earthquake was felt in parts of Pennsylvania.

"My team and @PEMAHQ are actively monitoring the situation and in contact with counties on any damage. We will keep Pennsylvanians updated," he said.

Biden has been briefed on earthquake, White House says

From CNN's Samantha Waldenberg

President Joe Biden has been briefed on Friday’s earthquake , according to White House press secretary Karine Jean-Pierre. 

Jean-Pierre  posted on social media  that the president is “in touch with his team who are monitoring potential impacts.” She added that the White House is in “touch with federal, state, and local officials as we learn more."

NYPD transit chief says no reports of structural damage to transit system following earthquake

There are no reports of damage to New York City's transit system following this morning's earthquake, New York City Police Department Chief of Transit Michael M. Kemper said.

Kemper said he has been briefed by his team regarding the earthquake felt across parts of the Northeast.

“There are no current reports of any structural damage and/or service disruptions to the NYC Transit system as a result,”  he said . “That said, our team is continuing to survey all lines & stations and we will keep you updated.”

No major incidents following earthquake, New York City Fire Department says

From CNN’s Nic F. Anderson in New York

The New York City Fire Department said there are no major incidents it is responding to at this time, in the aftermath of the New Jersey earthquake.

An FDNY spokesperson told CNN that around 10:30 a.m. ET, FDNY received reports of shaking buildings.

“We are responding to calls and evaluating structural stability. There are no major incidents at this time. We will continue to monitor," the spokesperson added.

Northeast earthquake is disrupting air travel

From CNN's Greg Wallace

A 4.8 magnitude earthquake in the Northeast is impacting air travel.  

The Federal Aviation Administration said flights to the New York Kennedy, Philadelphia, Baltimore, and Newark airports were being held.  

The air traffic control tower at Newark Liberty airport is being evacuated, a controller said in a radio transmission after the earthquake. That meant the flights were being held while controllers moved to an alternate location.  

"Nobody's going to go anywhere for the time being," a controller said over the radio frequency.  

The runways were in the process of being inspected for damage. Shortly after the earthquake, controllers at LaGuardia were still clearing flights for departure there.  

Federal Aviation Administration spokesperson Jeannie Shiffer calls the earthquake’s impact on air travel a “rapidly evolving situation.”

FAA will have to inspect runways at New York’s JFK and Newark airports before operations can resume.

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How do animals respond to eclipses? Help NASA find out.

A massive citizen science project will study how the animal kingdom reacts to April 8’s total solar eclipse. Here’s how and where to partake.

Tens of millions of sky-gazers are expected to watch the total solar eclipse above North America on April 8. Cheers, shrieks, and cries will welcome totality—the few fleeting minutes when day turns to haunting dusk. But humans won’t be the only species affected.  

The early onset of darkness disrupts animals’ circadian rhythms, sparking a possible chorus of owl hoots, cricket chirps, or even coyote calls, depending on the eclipse-viewing location. For centuries, biologists and spectators have shared stories about how animals respond to eclipses , yet few formal studies have tested this. NASA hopes to change that this year—and you could help.

Through the citizen-science project Eclipse Soundscapes , NASA is studying how these interstellar marvels impact the animal kingdom. Eclipse enthusiasts have a host of ways to participate : recording data, analyzing audio, or submitting their own multisensory observations, says Henry Trae Winter III, co-lead on the Eclipse Soundscapes project and chief scientist and co-founder of the ARISA Lab .

The project, inspired by a similar citizen-science study from the 1932 eclipse over New England, centers on how crickets respond to the event’s false dusk. These insects, which are largely dispersed across the U.S.’s path of totality from Texas to Maine , provide an ideal opportunity for widespread comparison. “If there’s something different in the south than the north, we can pull out why,” says Winter, noting they can analyze everything from temperature differences to eclipse duration (which will begin approximately 1:45 p.m. to about 4:30 p.m. EST) to analyze varying reactions. This intel could help scientists model how future weather events like storms could impact animals.

( 2024 will be huge for astrotourism—here’s how to plan your trip .)

While Eclipse Soundscapes focuses on crickets, which Winter says eclipse-chasers could hear any place that’s above 55 degrees Fahrenheit on eclipse day, the team’s massive data set—expected to be among the largest soundscapes recordings in history—will be free and open to the public.

To partake as an Eclipse Soundscapes observer, Winter suggests avoiding large-scale eclipse gatherings where crowd chatter will drown out critter sounds. Instead, eavesdrop on the animal kingdom via wild and more remote natural spaces—such as these five wildlife-packed getaways along April 8’s path of totality.

Ouachita National Forest, Arkansas

Arkansas ’ stretch of the 1.8-million-acre Ouachita National Forest , a mosaic of streams, peaks, rivers, and dense pine forests, brims with wildlife, including many species that could audibly respond to the area’s four minutes of totality. Listen for the barred owl, known for its “ who cooks for you ” call, or the long-eared owl, which often communicates via low hoots . Crickets will likely also join the eclipse symphony, as could the forest’s numerous bands of coyotes .

Cache River State Natural Area, Illinois

This swampy, 18,000-acre getaway in southern Illinois is known for its frogs , which experts say could get particularly noisy on eclipse day. Listen for bird-voiced tree frogs, southern leopard frogs, and bullfrogs, or watch for foxes and opossums , which could make unusual midday appearances. Travelers may enjoy these sounds throughout the park, but for a particularly unique totality seat, join Cache Bayou Outfitters’ solar-eclipse kayak trip .

Cuyahoga Valley National Park, Ohio

Cuyahoga Valley National Park’s thick oak, hickory, and beech forests will see roughly 3.5 minutes of totality on April 8. These dusky skies could kick off a harmony of animal calls, from frogs and toads, which reappear here in the early spring months, to the barn, barred, or great horned owls. For a multisensory perch, hit the Beaver Marsh , a former trash heap turned biodiverse wetland habitat with numerous frogs, turtles, birds, and its namesake and nocturnal beavers—which scientists say could skitter out from their daytime abodes as the skies dim.

( It was a toxic wasteland. Now it’s a national park .)

Letchworth State Park, New York

Birds are among the most boisterous animals during solar eclipses . The darkness may stimulate their urge to roost, increase their activity levels, or alter their song patterns. Watch and listen to the avian eclipse responses from one of New York State’s best birding locales, Letchworth State Park , which will experience around three minutes of totality. This patchwork of soaring cliffs, maples and beeches, and thunderous waterfalls, known as the “Grand Canyon of the East,” is a state Bird Conservation Area , as well as an Audubon Important Bird Area . It’s home to dozens of avian species, including turkey vultures and great horned owls, as well as beavers and river otters, which may emerge during totality near the Genesee riverbanks.

Congress Avenue Bridge, Austin

For a unique eclipse-response experiment, head to Congress Avenue Bridge in Austin . From spring to late fall, this concrete link over Lady Bird Lake is home to an estimated 1.5 million Mexican free-tailed bats—the largest urban bat population in North America. Experts say the area’s nearly two minutes of totality’s darkness could see throngs of the winged mammals swooping out to the east for their feasts.

( Bats are the real superheroes of the animal world. Here's why .)

Related Topics

• CITIZEN SCIENCE
• SOLAR ECLIPSES
• ANIMAL BEHAVIOR
• EDUCATIONAL TRAVEL

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How does the lottery work, anyway?

Whether you're an experienced lottery player or a newcomer testing your luck with this weekend’s $1.23 billion jackpot, here's a quick primer on how the game works.

• Kathleen St. John
• April 5, 2024

It’s happening again: A humongous Powerball lottery jackpot surpassing $1 billion  is up for grabs. With that kind of money on the line, you may be tempted to pick up a ticket or two yourself.

But if you’re new to the game, it all might seem a bit strange. What power does this ball possess?

It’s all in the draw: Each Powerball drawing picks five white, numbered balls and one red ball. In order to win the grand prize, a player must match all five white numbers and the red number. Mega Millions , another national-level lottery, is similar.

As of this writing, no one’s hit the jackpot in weeks. And so it grows.

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Whether you’re interested in one of the nationwide lotteries or your state’s weekly drawings, you probably have questions. Here’s a quick primer on lottery basics — unfortunately, we can’t increase your (extremely long) odds of winning, but at least you’ll know a little more about how the game works.

Where Do Lottery Prizes Come From?

Lottery prize money is generated by ticket sales. The more people that buy tickets — and the longer it goes before somebody wins the jackpot — the bigger the prize.

Some folks like to choose their own numbers, but players can also opt to “quick pick” and let the ticket machine select a random set of numbers for them.

According to Lotto.com , 181 million Americans purchase at least one lottery ticket per year. The North American Association of State and Provincial Lotteries (NASPL) reported that U.S. lottery sales totaled over $113.3 billion in 2023 . The addition of online lottery ticket sales has made it even easier to get in the game, so more people are funding the jackpot by simply pressing a button on their smartphone to buy a ticket.

And, in 2021, Powerball added a third weekly drawing on Mondays, helping their jackpots grow bigger, faster. By the end of that year, Americans had spent more than $95 billion on lottery tickets.

Where Does Lottery Revenue Go?

It varies by state, but about 50%-60% of lottery ticket revenue goes into the prize pot, and the rest gets divvied up between various administrative and vendor costs, plus toward whatever projects each state designates.

“Lottery revenues are allocated differently in each state, with determinations made by state legislatures,” Carole Bober Gentry, a spokesperson for the Maryland lottery and the Mega Millions national lottery, told ABC News .

“In many states, the money goes to public education, but some states dedicate it to other good causes,” Gentry said.

If you’re curious about your state, the North American Association of State and Provincial Lotteries shares how much lottery money each state spent in 2023, and which programs received funding .

How Are Lottery Numbers Drawn?

Time for the fun part!

There are two main types of lottery-drawing machines: the air mix machine and the gravity pick machine. The air mix is the one that blows numbered ping-pong balls around in a chamber. Numbers are randomly selected when they get sucked out of the chamber and displayed.

Gravity pick is the method used by Powerball and Mega Millions: A drum constantly bounces and mixes the numbered balls as it spins. When the time comes, the balls that fall out of the machine and onto a rack are the chosen ones.

Mega Millions describes their drawing process as taking “approximately three hours for a drawing that takes less than 60 seconds.” Before every drawing, the lottery machines and balls are inspected by independent auditors to ensure random results. All of the equipment is stored securely before and after the drawings, too.

Lottery Payout Options

There’s one question that lottery fans never get sick of debating: What’s the best way to receive your lottery payout if you win big?

There are two payout options: A lump sum payment or an annuity, where the money is paid out over time.

The annuity nets you the full amount of the jackpot over the course of 29 annual payments, plus one initial payment when you claim your prize. You’ll have to pay taxes on the prize money each year.

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The lump sum is attractive because you’ll only pay tax on your prize once. However, the amount paid will be approximately half of the advertised amount, depending on the lottery’s rules and current interest rates.

That means the $1 billion-plus Powerball jackpot will come out to a still-astronomical $500 million or so if the lump sum payment is chosen.

How Much are Lottery Winnings Taxed?

For starters, the IRS will take a chunk off the top of any winnings over $5,000 — a mandatory 24% federal withholding that must be paid immediately.

Big-money winners also need to consider that they’ll be bumped into the top tax bracket, paying 37% income tax.

Then there’s state tax to consider, though a handful of states, including California and Texas, don’t tax lottery winnings .

MORE: 5 times the dreaded ‘lottery curse’ was broken

Basically, the huge payoff comes with huge financial responsibilities — it’s not all luxury cars, yachts and private jets. That’s why most experts recommend winners hire a wealth manager or financial advisor as soon as the prize is secured.

Wealth managers can identify the various tax obligations and pay them on your behalf, plus devise investment and giving strategies for the years ahead.

If you suddenly find yourself in the position of needing a wealth management team, congratulations! You’re officially one of the lucky ones.

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