A nonprofit organization called the Fermi Explorer Mission announced today that it intends to launch a spacecraft to our nearest star system by the end of 2029. 

It’s a hugely ambitious mission—if all goes well, the spacecraft could take up to 80,000 years to arrive at Alpha Centauri, which is 4.4 light-years away. And the spacecraft will follow a novel trajectory discovered by an AI system developed by Physical Superintelligence (PSI), an AI physics research lab. PSI is launching today with $58 million in funding led by Breakthrough Energy, a climate-focused investment group founded by Microsoft cofounder Bill Gates.

It’s not the first time this has been tried. In 2016, the billionaire tech investor Yuri Milner announced an interstellar mission called Breakthrough Starshot to launch humanity’s first spacecraft to Alpha Centauri. The plan was to use powerful lasers that would propel tiny probes to a fifth of the speed of light—fast enough to reach Alpha Centauri within 20 years. Milner pledged $100 million toward a proof of concept. But a decade later, nothing has launched.

“We didn’t want to do another Breakthrough Starshot,” says Philip Johnston, the cofounder and president of the Fermi Explorer Mission. “We’re dead set on something actually launching.”

To do that, “we are not constraining ourselves to doing it in a human lifetime,” says Johnston. “Let’s just figure out the way to get to another star.” 

The new mission, currently funded by individual private donors, is expected to cost just $15 million. The spacecraft will carry cargo weighing at least one kilogram. That will include artistic and scientific payloads, messages, and a copy of the Golden Record, a gold-plated disc of Earth’s sounds and images that NASA attached to its two Voyager probes in 1977 as a message to any civilization that might find them.

Engineering an interstellar journey is extremely difficult. Alpha Centauri is about 25 trillion miles away from Earth. One of the fastest objects that humans have ever launched, the Voyager 1 probe, has been flying since 1977 and has covered less than 1% percent of that distance. At its speed, the trip would take more than 70,000 years.

Johnston and his team spent a year trying, and failing, to find a way for a small, solar-powered spacecraft costing only $15 million to reach Alpha Centauri. They kept running into the knotty problem of how to give the spacecraft enough power without making it too heavy (and thus more fuel-guzzling). 

After the Fermi team struggled to find a workable route, Johnston mentioned the problem in a podcast hosted by Alex Wissner-Gross, a physicist who cofounded PSI. Wissner-Gross offered to run it through an AI system the lab developed, called Get Physics Done. It’s open-source software that takes a physics research question, breaks it into smaller tasks, and decides which simulations to run, using AI models including Anthropic’s Claude or OpenAI’s GPT.

A week later, the AI system turned up a novel trajectory, to Johnston’s surprise. It combined well-known orbital maneuvers in a way the Fermi team had not considered, according to a paper that has not been peer-reviewed. It suggested that the spacecraft could first slow down so its orbit swings in close to the sun—closer than Mercury. On each close pass, it would fire its engine so that the solar panels get four times the light, and a burst of thrust delivered at high speed would buy more energy than the same burst anywhere else. Because the engine would run only near the sun, the solar panels could stay small and the spacecraft light.

The system conducted the research mostly on its own for three days, running on a billion tokens, says Matt Pines, the cofounder and CEO of PSI. An astrophysicist on PSI’s staff steered it to follow the mission’s requirements, asked for a cost analysis and clearer charts, and checked the output for errors.

“The fact that it came up with an entirely different mission profile, one that was creative and not one [the Fermi team] had considered—that was the more surprising aspect,” says Pines. Still, the model lacks a human researcher’s judgment and taste, he says. It has no reliable sense of which problems are interesting or which approaches are worth pursuing, so it often gets stuck chasing dead ends or failing to explore different approaches. “I don’t think we’ve yet figured out how these models can internally represent something like that,” he says of research judgment.

Even if the Fermi probe launches, “we’re pretty confident that we will not be the first to arrive” at Alpha Centauri, says Johnston, since he expects spacecraft technology to improve. If an engine a thousand years from now is even 20% faster than today’s, a spacecraft launched then would still beat Fermi’s probe to Alpha Centauri by more than 10,000 years. 

But the Fermi project isn’t just an interstellar mission driven by engineering ambition. It’s also a quest to answer one of the oldest open questions in physics. In 1950, the physicist Enrico Fermi posed a puzzle: The galaxy has hundreds of billions of stars, most of them far older than our sun. Even a civilization traveling slowly between stars could spread across the whole galaxy in a few million years, which pales in comparison to how old the galaxy is. If there is intelligent life somewhere, we should have seen signs of its existence by now.

That means either reaching for another star is too difficult or other intelligent species simply haven’t bothered. But once the Fermi probe launches, we will become a civilization that can and wants to reach another star, meaning that neither explanation might be what’s keeping the galaxy unexplored. That could point us toward more unsettling possibilities, says Johnston. Maybe life like ours is almost unimaginably rare. Or maybe intelligent life is common but tends to die out before it can spread. 

If the latter is true, “one of those reasons could be that once you hit superintelligence, that for some reason is self-destructive,” says Johnston. “Maybe in the next 50 years, there’s some great filter that we do not pass through. That all intelligent civilizations, for some reason, do not pass through.”

A company that plans to beam sunlight from space to Earth on demand might unintentionally brighten the night sky for many more people than intended, according to a new study.

Later this year, the US company Reflect Orbital plans to launch a test satellite called Eärendil-1 that will extend an 18-by-18-meter mirror in orbit. The goal is to test the feasibility of the company’s plans to launch up to 50,000 larger satellites, measuring 54 by 54 meters, and reflect sunlight to Earth on demand.

The case for doing this remains somewhat uncertain, but Reflect Orbital has said the goal is to prolong the hours of sunlight for various uses, including solar panel charging, emergency response, and military activities.

The launch, which was approved by the Federal Communications Commission in July, has been met with disbelief by astronomers and environmental groups. “This is incompatible with astronomy,” says Samantha Lawler, an astronomer at the University of Regina in Canada. “There is no way you can do this and preserve dark skies.”

Miroslav Kocifaj, an astronomer at the Slovak Academy of Sciences, and his colleagues have now calculated the broader effect on the night sky. In a new paper published online and accepted for publication in the space journal Astrophysical Journal Letters, they studied the extent to which the light the satellites beamed to the ground would scatter.

They found that within the beam’s target area, intended to be a circular patch five kilometers across, a single Reflect Orbital satellite would appear about 40 times brighter than the full moon in the sky. As far as 14 kilometers away from the center of the beam, the satellite would still be as bright as the full moon. 

Combining the beams of 400 satellites, which Reflect Orbital eventually plans to do, would yield a light as bright as 10,000 full moons within the five-kilometer area, or 2.4% as bright as the sun. Even up to 80 kilometers away, Kocifaj and his colleagues calculated, this combined beam would be visible as “a glow above the horizon,” he says. That means the night sky would be altered for many more people than those within the area Reflect Orbital intends to illuminate.

“Deploying these mirrors would be seriously damaging for astronomy and for the nighttime environment,” says Kocifaj.“ The damage extends far beyond the target area.”

Olivier Hainaut, an astronomer at the European Southern Observatory in Germany, says the results of the paper are not surprising but are still useful. “These guys are really good at that kind of modeling,” he says. “They know what they’re doing.”

Hainaut had previously modeled the broader effect of Reflect Orbital’s beams, finding they would brighten the sky up to 300% worldwide. This latest work gives an even more complete picture of what the impact would be. “These two papers really cover most of it,” he says.

Reflect Orbital CEO Ben Nowack disagrees with the findings of Kocifaj’s paper. “Some assumptions are simply inaccurate,” he says. “The critical point is that our safeguards, including maintaining exclusion zones, take account of scattering.”

He says that the company has “engaged substantively with legitimate concerns raised by astronomers, environmental researchers, and scientists,” and that their feedback has “informed our technology and operational plans.”

Kocifaj says that Reflect Orbital has not provided data to back up its claims. The company “states that safeguards exist, that scattering is taken into account, and that the models are being updated, but it gives no numbers, no description of the model, no assumptions, and no data,” he says. “There is therefore nothing that can be engaged with technically. Our calculations produce concrete figures.”

Reflect Orbital’s intention is to place its satellites into highly inclined orbits above Earth, almost from pole to pole. This will enable them to reflect sunlight in the hours before sunrise and after sunset, extending daylight hours in certain locations. Eventually, the company has said, it wants to place satellites high enough to provide light 24-7 to locations on Earth.

In August, a group of organisations including DarkSky International and the American Bird Conservancy urged the FCC to review its approval of the Eärendil-1 satellite. As well as the impact on astronomy raised by this and future satellites, the group also highlighted potential negative consequences for aviation and wildlife.

“Our primary request is straightforward: Reverse the Space Bureau’s order, and require a lawful public-interest and NEPA [National Environmental Policy Act] review,” the group said in a statement.

The satellites could also pose risks to humans, according to Reflect Orbital itself. In a filing with the FCC in March, the company said that observing Eärendil-1 with a telescope larger than 12 inches —which many astronomers have access to—may be unsafe for human eyes. It added, though, that such observations are “unlikely to … result in significant injury” because the satellites are not constantly bright.

Currently there is no global entity that could regulate satellites such as these, so approval falls to national regulators such as the FCC in the US. Michelle Hanlon, a space lawyer at the University of Mississippi’s School of Law, says there are “real benefits” to the plans proposed by Reflect Orbital. “It could extend the productive hours of solar facilities and provide light in remote areas or after a disaster,” she says.

However, the “legal basis is less clear than the technology,” she says. The FCC “does not have authority to license or regulate the operation of the solar reflector itself.” It can only authorize the use of radio frequencies to communicate with the spacecraft.

That means Reflect Orbital will need permission on a national and local level to reflect sunlight onto the ground, but if the beams spread as much as Kocifaj and his team predict, “the company could need approvals in more than one jurisdiction,” says Hanlon. “There may also be aviation-safety and cross-border questions.”

The fierce debate over the satellites shows no signs of abating. “It makes me sad that astronomers are having to spend their time doing these sorts of calculations rather than actually doing astronomy,” says Lawler. “This is not what we want to spend our time on.”

When the four astronauts on board NASA’s Artemis II swung around the moon earlier this year, they set a new record for the farthest humans have ever ventured from Earth, surpassing the distance set by Apollo 13 in 1972 by some 4,000 miles. 

While no space mission can live up to the historic touchdown of Apollo 11—a spectacle that 20% of the world population watched live—Artemis II still attracted massive public interest. It drew tens of millions of viewers and inspired outpourings of “moon joy,” a term coined spontaneously during the mission that became a viral sensation. 

The expedition is only the first in a planned series of ambitious missions. The Artemis program aims to establish a human base on the south pole of the moon, operated by the US and its international and commercial partners, during the 2030s. China and Russia have teamed up to build their own crewed lunar base in the same region and on a similar timeline. Meanwhile, companies like Blue Origin and SpaceX hope to lock down the burgeoning extraterrestrial tourism market by flying civilian astronauts on private missions, with the long-term dream of taking them to the moon—or even Mars. 

But some overarching questions about this new era of space exploration linger, including perhaps the most existential one of all: What’s the point? Launching humans into space is dangerous and expensive, and it’s unclear whether it can deliver a better return on investment than we’d get if we were to send robots in our stead to make scientific discoveries or to conduct commercial activities, such as mining.

Since the dawn of human spaceflight, this line of questioning has been met with countless answers. We go to space for geopolitical prestige, manifest destiny, spiritual fulfillment, scientific curiosity, and, increasingly, business opportunities. 

In the wake of Artemis II, a slew of new books suggest that these justifications are subsumed by one unifying fact: Humans have itchy feet, and we are simply wired to roam. No matter the merits of any single rationale for sending people to space, they are all downstream of the basic evolutionary instinct to expand and adapt, which may not require much rational explanation at all. 

This simple motivation for human spaceflight is usually framed as aspirational: Explore new places, break new ground, adapt environments to suit our needs. But as our presence in space expands, we are bound to bring along the same human foibles that have stymied us on Earth. Frontiers like the moon and Mars will no longer be some hazy dreamlands onto which we can project our hopes, values, and favorite visions from science fiction. They will be workspaces for astronauts, places of commerce, military domains, tourist destinations, and heritage sites.

How we deal with all that is, literally, up in the air. At the moment, a relatively small group of players in human spaceflight have an outsize role in determining the path forward, with SpaceX CEO Elon Musk standing as the most conspicuous example. But shrugging off the drive to leave Earth as an itch for exploration and domination that only nation-states and the ultrarich can scratch won’t cut it any more. Now is the time for everyone who cares about space exploration, no matter their backgrounds, to advocate for their own visions of our off-Earth future—before it is decided for them. 

The new space race

During the Apollo era, the justification for blasting astronauts into space was clear-cut: brinkmanship. As Cold War tensions peaked in the 1960s, the United States and the Soviet Union had every reason to demonstrate their technological prowess through human spaceflight. 

To be sure, the feat of sending humans to the moon inspired millions of people, many of whom went on to work in science and engineering. Chiao credits his own career as an astronaut to the Apollo 11 landing, which he watched, riveted, as an eight-year-old child in Wichita, Kansas. Decades later, he flew three space shuttle missions and served as commander of the International Space Station.

But while early milestones were met with giddy excitement, the space race was fundamentally animated by an implicit threat. Whichever nation proved superior in space could easily trade nuclear warheads for the astronauts it was launching on rockets that were essentially modified missiles. 

Fortunately, we are no longer on the brink of nuclear war <knock on wood>. NASA is, however, making an overt case that America is embroiled in a new space race, this time with China. Whereas the US and the USSR used spaceflight as a symbolic proxy for global technological dominance, Chiao told me in an interview that the new first-place prize could be uncontested access to valuable resources such as water, which could be sourced from ice patches on the south pole of the moon. 

Space law prohibits any nation from owning part of the moon, but these aging rules are about to endure road testing. Both the US and China plan to establish bases on the lunar south pole designed to support human crews for long periods. These outposts will inevitably be powered by nuclear reactors, so safety will require exclusion zones around them. 

The desire to spread our species beyond the planet is about more than technocratic bragging rights. It’s also ancient, primal, and perhaps unstoppable.

As a result, there could be a first-mover advantage to setting up shop on the most resource-rich patches of the moon, even if a nation never officially owns them. This is all speculative at the moment, and many skeptics in the legal, political, financial, and public spheres have cast doubt on the idea that a thriving market for space resources will materialize—at least in the near term.

Still, the rough contours of a human spaceflight economy—reaching to the surface of the moon and perhaps beyond—are beginning to take shape, and governments aren’t the only ones with plans to capitalize. Musk ultimately wants SpaceX to launch millions of civilians into orbit and eventually establish a permanent settlement on Mars. Whether or not those grand visions pan out, the company continues to make moves toward space tourism. Meanwhile, Blue Origin, the company founded by Jeff Bezos, has ferried more than 80 civilians on brief flights into suborbital space, including Star Trek icon William Shatner; pop star Katy Perry; and Jahangir, a cardiologist whose book describes the realization of a lifelong dream.  

Jahangir, who was born in Iran and grew up in Tennessee, worked tirelessly for years to qualify as an astronaut with NASA but never made the cut. He finally got his chance to leave Earth after winning a raffle for a seat on Blue Origin’s New Shepard–26 mission, which achieved a 10-minute flight to an altitude of 65 miles in August 2024.

For Jahangir, the flight was the ultimate pilgrimage. “To get to those ten minutes took forty years of dreaming and twenty years of hustling,” he writes in his memoir. “It was not the future I expected, growing up with plans to be a NASA astronaut, but it was the future I was given, and one I am grateful for.”

While these forays are personally fulfilling, from a business standpoint the core purpose of space tourism is, as ever, to turn a profit. And there are signs of some public discomfort with the increasing commodification of human spaceflight. Take, for example, the intense backlash to the all-­female Blue Origin mission that flew celebrity passengers like Perry, journalist Gayle King, Bezos’s now-wife Lauren Sánchez Bezos, and several others in April 2025. The attempt to brand the mission as a feminist milestone was mercilessly mocked online, hinting that questions about who gets to go to space, how they get there, and what they take away from the experience may inspire more acrimony and debate as these flights become increasingly common.

Expansionism of all sorts

Space visionaries are currently testing next-generation rockets, drawing up blueprints for moon bases, and racing to claim a stake in the future of human spaceflight. But the desire to spread our species beyond the planet is about more than technocratic bragging rights. It’s also ancient, primal, and perhaps unstoppable. And that isn’t a bad thing—harnessed properly, it could have benefits for our lives not just in space but on Earth. 

Weibel, who studies pilgrimages through an anthropological lens, points to the deep roots of our human yearning to voyage to a hallowed spot and be transformed. For decades, she has chronicled the stories of pilgrims who seek out the Black Madonna statue in the village of Rocamadour in southwestern France. The sculpture sits in a chapel built into a cliff, so visitors experience a sense of vertigo intermixed with spiritual wonder. 

Weibel’s “ultraview effect” is the cosmic version of this sensation—a spin on the overview effect, a term coined by the space philosopher Frank White to describe the revelatory experience of viewing Earth from orbit. The ultraview effect turns the astronautic gaze in the other direction, out into the incomprehensible immensity of the universe. Spacefarers report a feeling that is awesome and sublime in the old senses of those words: Their wonder is tempered by alienation, incomprehension, and what the 18th-century philosopher Edmund Burke termed “delightful horror.”

“These moments of wonder or strangeness, such as the ultraview effect,” are “when we realize the extent of the vast mysteries we are not equipped to understand,” Weibel writes. 

As if to make her point, at a NASA briefing in April, Reid Wiseman, the commander of Artemis II, recalled seeing the moon eclipse the sun from lunar space and telling a crewmate that he didn’t think “humanity has evolved to the point of being able to comprehend what we are looking at right now.” 

The story that initially inspired The Ultraview Effect came from the same distant location, the far side of the moon—though it occurred decades ago. Weibel recounts her conversations with “Zack,” an Apollo command module pilot whose name was changed for anonymity. Turning away from the moon, Zack gazed out into the dizzying endlessness of space, with all the lights on his spacecraft switched off so he was “dark-adjusted.” But the takeaway was the same. “It changed my view of infinity,” Zack told Weibel. “Infinity is just something beyond what we can contemplate. So that changes your outlook on everything.”

Even without full immersion into darkness, suborbital passengers on commercial flights have reported a touch of what might be described as the ultraview effect. For instance, Shatner was clearly rattled after his Blue Origin flight in 2021. He described Earth’s skies as a “comforter of blue” and our planet as “mother” and “life,” but looking away from our world, he saw only a “black ugliness.” 

“Was that death?” he asked. “Is that the way death is?”

Likewise, Jahangir was struck by the contrast between the classic overview effect and its ultraview corollary. Earth “was brighter than anything I had imagined,” he writes in A Heart for Space. “Then I shifted my gaze up just slightly and saw the vastness and darkness of space. It was the blackest black I have ever seen, like staring into an inkwell. I just gazed, unable to comprehend what was before me and knowing that our atmosphere, our Earth, is home—a home we should protect at all costs.”

These anecdotes transcend any practical argument for human spaceflight: The constant jockeying for “top dog” status, the allure of unfathomable revenue, or the spinoff technologies that could lead to scientific breakthroughs. Pull off those layers and you have the hero’s journey. Across eras and cultures, some people simply feel the need to chase the horizon. Often, pilgrims in history and legend never return home. But when they do, they tend to bring back wisdom and guidance for a better world. 

For Elon Musk, the hero’s journey means expanding human life to Mars and beyond, to find a permanent presence among the stars. As Weibel explains, this idea is not new. For centuries, space visionaries have cast human space exploration as the final phase of our maturation as a species, a sentiment the Russian rocketry pioneer Konstantin Tsiolkovsky summed up by declaring, “Earth is the cradle of humanity, but one cannot live in a cradle forever.” 

The dream of an interstellar Earthling diaspora, one that could guarantee our continuation as a species, is hugely appealing, both as grist for science fiction and as a road map for our human future. But for Chiao, who is stoic on these matters, deliverance in space is a mirage. 

“It’s important to develop a way to deflect asteroids and develop a way to have humans sustainably live on a place like Mars, but to me, at some point we end,” he told me. “I know it sounds a bit odd, but there’s some comfort in that knowledge. We’re not in this race to save ourselves. There seems to be order in the universe, and probably every group of intelligent life has its own cycle. It’s okay to be extinct.”

In that scenario, our robotic spacecraft may outlive us. Even now, they are our most daring emissaries: They can surf the sun, explore hostile planets, and even break into the interstellar frontier. But while these spacecraft are our scouts, many people will always prefer to see themselves in space. “People identify when there’s a human out there doing it,” Chiao told me. “We’re just thrilled and amazed to see what comes back from these robotic probes, but I think you need both.”

Weibel points out that during the Apollo era, robotic spacecraft took pictures of Earth from lunar orbit. But it wasn’t until Bill Anders, an astronaut on board Apollo 8, snapped the famous “Earthrise” shot that the otherworldly view really hit home for the public. Similar shots from the Artemis II astronauts went viral, including a picture of Christina Koch gazing through the spacecraft window at Earth.

There are lots of reasons for humans to stay grounded, from the dangerous nature of spaceflight to the medical complications of long-term radiation exposure to the gargantuan expense. But it is unlikely we will stay put on Earth, even if we never make it far—for the same reason our ancestors crossed deserts, oceans, and mountains.

“Knowing somebody’s been there and can tell us about it when they come back—that’s a whole other level of it that makes it more compelling,” Weibel told me. “I’m not 100% sure why,” she adds, “but we trust witness testimony.” 

Becky Ferreira is a science reporter based in upstate New York and the author of First Contact: The Story of Our Obsession with Aliens. 

Roman Chiporukha has long turned wild travel dreams into reality. Over two decades as co-owner of the luxury lifestyle firm Roman & Erica, he has orchestrated everything from the construction of a client’s superyacht to vacations in the Bahamas at a location so private that guests must sign an NDA. 

The experiences earned him “the ear,” he says, “of the ultra-high-net-worth audience.” It also led to a life-changing phone call: In 2018, Axiom Space wanted to find citizen explorers willing to pay $50 million each to join the first fully private mission to the International Space Station (ISS), slated for April 2022. 

This showed Chiporukha that the sky was no longer the limit; it was the market. He successfully signed up a private astronaut and then launched SpaceVIP in 2021 to offer celestial experiences that mix culture, science, and purpose. 

Here’s what it takes to become the Expedia of the cosmos.

A willingness to do your homework

Chiporukha isn’t an astronaut or aerospace engineer, so he had to fast-track his own education on the nuances of commercial spaceflight. To help private citizens skip the rocket-science headache, he has wrangled the highly fragmented space sector into a single, seamless digital portal, so adventurers can investigate suborbital flights and far-out itineraries as effortlessly as they would a weekend getaway. But he insists they still need an expert fixer who can secure “the perks, the custom requests, and the upgrades.”

The power to align wants with reality

SpaceVIP receives dozens of inquires a month, but Chiporukha helps just a small, exclusive roster design custom adventures based on their budgets and physical comfort zones. Acting as a bridge between starry-eyed dreamers and strict aerospace parameters, he works with operators like Axiom for multiday stays on the ISS, and with Blue Origin, SpaceX, and Virgin Galactic for other excursions. Spacefarers can choose, for example, a zero-gravity parabolic flight or a smooth six-hour voyage aboard a stratospheric balloon 15 miles above Earth—an option he says is “relatively affordable,” if you’re a person for whom a few hundred thousand dollars isn’t that much.

Ability to inspire a new generation 

Making space travel widespread is an uphill climb in terms of cost and technology. But, Chiporukha adds, more people simply need to be interested. He cofounded the Space Prize Foundation, a nonprofit that runs science competitions for young women and groups underrepresented in STEM. Winners get zero-gravity flights and entry into immersive astronaut-training programs. “Making space more mainstream isn’t just about bringing down the cost of a ticket,” he says. “It’s about creating pathways into the industry and helping people understand that this future shouldn’t belong to a tiny group.” 

Correction (August 17): An earlier version of this article said that Chiporukha signed up three private astronauts for the ISS, instead of one, before founding SpaceVIP.

Linda Childers is a California-based freelance journalist who writes about science, education, and health.

At the end of August, NASA is set to launch the Nancy Grace Roman Space Telescope from Kennedy Space Center in Florida. Its goal is to help us better understand how the universe works, from the glue-like dark matter that keeps galaxies together to the elusive dark energy that drives the expansion of the cosmos. But Roman could also serve another purpose: defending Earth from killer asteroids. In September, a multi-institutional team of planetary scientists and astronomers will outline how the space telescope is uniquely placed to scan asteroids and provide information about their trajectories, sizes, and compositions.

Roman, named after NASA’s first chief astronomer, is equipped with a super-wide-angle, 300-megapixel infrared camera, allowing it to see a large patch of space at any one time—roughly 100 times larger than is possible with the Hubble Space Telescope. That will allow it to discover thousands of new planets and tens of thousands of exploding stars, and survey over a billion galaxies in remarkable detail.

While doing so, it’ll be looking “through” our solar system, and this is what makes it uniquely well placed to spot asteroids. 

A planetary defense pivot

Roman was not built for this purpose, but last summer, it was (once again) threatened with significant funding cuts by the Trump administration. “My colleague Rick Cosentino [a planetary scientist at NASA] said to me in July 2025 that we need to show what Roman can do for planetary defense as a way to further increase the visibility of the mission with lawmakers and taxpayers,” says Bryan Holler, a researcher at the Space Telescope Science Institute in Baltimore.

Holler and his colleagues’ proposal, which will be presented at the Europlanet Science Congress at The Hague, reveals that Roman’s epic field of view and infrared vision allow it to spot small asteroids up to 60 feet long. This is comparable to the asteroid that exploded above the Russian city of Chelyabinsk in 2013, unleashing the force of 500,000 tons of TNT and sending 1,500 people to the hospital. 

Roman’s software will need some tweaking to spy space rocks. The telescope, as designed, will see through—and beyond—the solar system in order to gather the clearest possible pictures of the rest of the universe. “Streaks, whether caused by cosmic rays or glitches or asteroids, are caught by the software and discarded,” says Andy Rivkin, a planetary scientist and planetary defense researcher at the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland. But astronomers could go in, study those streaks, and pick out those they identify as asteroids.

Even with those potential adjustments, Roman won’t be an asteroid-finding wunderkind on its own. Its strength lies in its ability to complement the James Webb Space Telescope (JWST), another observatory that’s built to peer at galaxies and stars in the far reaches of the universe. It can also intensely focus on a single asteroid when needed—as it did last year, playing a key role in tracking 2024 YR4, which was briefly the most dangerous asteroid ever discovered. “But Roman’s field of view is much bigger,” says Rivkin. 

That means it could look at multiple questionable asteroids very quickly. “Roman can provide infrared observations of more asteroids than JWST could hope to observe in a reasonable amount of observing time,” says Holler.

If those asteroids are found to be benign travelers, we can relax. But if they might collide with Earth, other telescopes—including JWST—can follow up from Roman’s observations. Those observations could give experts the information they need to assess the likely damage of an upcoming asteroid strike—or to launch a mission to attempt to swat an asteroid away.

“Roman will sample such a large volume of the cosmos that we’ve long known it will offer vast opportunities for a range of additional science,” says Alise Fisher, the astrophysics communications lead at NASA headquarters in Washington, DC. 

NASA’s Planetary Defense Coordination Office, and its partners across the world, are chiefly worried about asteroids 460 feet long and larger. Around 25,000 of those are estimated to have near-Earth orbits, and just over half have yet to be found. Should one hit a city, much of it would be destroyed or irreversibly damaged in a heartbeat. Astronomers estimate that there are also 230,000 or so 165-foot-long asteroids orbiting close to Earth, and fewer than 10% have been located. A strike on a city from one of those might not annihilate it, but it would unleash a force comparable to that of a large atomic bomb, albeit without the radiation. 

Such an asteroid could theoretically be deflected (by ramming a spacecraft into it) or vaporized (perhaps using a nuclear weapon). But planetary defenders need to know where they are first, which is why NASA funds a network of ground-based telescopes designed to seek them out. They work well, but there’s only so much of the night sky they can see, and Earth’s atmosphere peskily gets in their way.

That’s why NASA is launching the Near-Earth Object (NEO) Surveyor space telescope in 2027. By positioning itself between Earth and the sun, it’ll find many elusive asteroids that ground-based telescopes cannot see. And unlike many of its asteroid-seeking cousins, it’ll see in infrared, not visible light. Not only do asteroids show up more clearly in infrared, but seeing them through this lens gives scientists a considerably better measure of their size. In a matter of years, it could find 90% of the city-killer-size asteroids in near-Earth orbits.

Telescope teamwork

NEO Surveyor is explicitly a planetary defense observatory. But it’ll work with other telescopes with more science-minded missions, including Roman and JWST (both of which conveniently have infrared scopes too) as well as the Vera Rubin Observatory, which just began its 10-year survey of the entire night sky from atop a mountain in Chile. As part of its inventory of the cosmos, it’s expected to discover 89,000 near-Earth asteroids. 

Here’s how they might all work together. Say NEO Surveyor spies an asteroid that, to judge from a few observations, has a chance of impacting Earth. Then it finds five more just like it. Those initial observations leave a lot of uncertainty about their orbits. Roman, with its huge field of view, could be commanded to look at the corner of the night sky that includes all those asteroids, and in a matter of days it could improve the precision by several orders of magnitude.

Roman also occupies a different part of space from both NEO Surveyor and the Rubin observatory. “Those slightly different viewing angles will also help narrow orbits down more quickly than if all objects were looking from the same place,” says Holler.

Perhaps five of those potentially hazardous asteroids are found to stand no chance of colliding with Earth for the foreseeable future. One, however, might not be able to be ruled out—and that’s when other telescopes, including JWST, could be asked to track it down and study it further.

“Telescope resources, whether in space or on the ground, are typically oversubscribed and will not be available to follow up on all [near-Earth asteroids] with a non-zero impact probability when they are first discovered,” says Holler. Roman, then, will help scientists “make sure we follow up on the correct targets.”

Roman’s infrared scope also allows it to offer a decent estimate of an asteroid’s size and can even tell whether it’s a stony rock, a puffy and watery carbon-rich rock, or a metallic one. “This in turn provides strong clues to the composition and thereby the density and mass of the asteroid, which are important when estimating the impact damage or, less ghoulishly, the effort required to nudge it out of its current orbit,” says Holler.

Roman won’t play the lead role in protecting Earth in the way NEO Surveyor will. But while it’s seeking out supernovas and planets scooting around other stars, it will also be doing its part to protect all 8 billion of us from a cosmic catastrophe.

When NASA’s Nancy Grace Roman Space Telescope launches, as early as the end of next month, it will attempt one of astronomy’s most precise disappearing acts to date. The telescope will carry the first space-bound “active” coronagraph, an instrument that effectively erases most of the light from a star during photography.

It will allow astronomers to take the first pictures of planets orbiting other stars that are similar to those in our solar system. Ultimately, it could pave the way for a future mission that could snap the first photos of Earth-like worlds.

“I hope it’s remembered for it being that critical stepping stone for … finding Earth 2.0,” says Brandon Creager, the instrument’s lead mechanical engineer at NASA’s Jet Propulsion Laboratory (JPL).

Named after Nancy Grace Roman, NASA’s first chief of astronomy, this new telescope will carry a roughly 300-megapixel wide-field camera that will enable it to capture images about 100 times larger than the Hubble Space Telescope’s widest exposures at a similar resolution.

These capabilities will help astronomers unpack the mysterious identities of dark matter and dark energy—and to detect around 100,000 new exoplanets, planets outside our solar system, whose presence can be inferred from the way they distort the starlight of more distant stars. Javier Viaña, a research scientist at Harvard who has had two projects selected for Roman’s highly competitive first year of observing, compares the leap to moving from “interviewing a handful of people” to “conducting a global census.”

Another camera will use the coronagraph, blocking out a star’s light as it observes one stellar system at a time. The instrument will allow astronomers an unprecedented look at the space around stars, enabling them to see smaller, dimmer, and more close-in exoplanets. “It’s giving us the ability to see planets that we haven’t been able to physically see before,” says Creager.

The anatomy of a vanishing trick

Coronagraphs in space aren’t new. But earlier incarnations, such as those currently aboard Hubble and the James Webb Space Telescope, use a stationary system to block a star’s blinding light. The approach does help, but it’s a bit like putting your thumb over a flashlight while searching a dark room for a firefly. Though the bulb vanishes, stray glare can still escape and overwhelm the light of the insect. Inside a telescope, that glare can come from light leaking around the edges of machinery or from minuscule imperfections in mirrors and coatings that can scatter starlight into speckles. All this can hide, or even impersonate, a planet.

Roman’s coronagraph, however, will attempt something completely unseen in space telescopes until this year: Before each observation, it will measure that leftover light and try to suppress it, a technique known as active wavefront control.

The telescope is able to do this because it contains two deformable mirrors. Each has a 48-by-48 checkerboard of actuators (tiny pistons) beneath a thin, deformable sheet of glass. Applying a small amount of voltage makes the actuators contract and tug their patches of mirror slightly backward, like thousands of microscopic fingers delicately sculpting a surface.

The effect is very subtle: Each patch of mirror can deform by up to 0.5 micrometers, or about one-fourth the size of an E. coli bacterium, and in increments as small as approximately 10 picometers. That’s about a tenth the diameter of a hydrogen atom, says Ilya Poberezhskiy, the instrument’s project systems engineer at JPL.

The actuators allow the mirrors to create an “active wavefront,” where each component is moved to the perfect position to cancel out incoming waves of unwanted light—a bit like a pair of noise-canceling headphones, but for light instead of sound. The “canceled-out” light creates a “doughnut-shaped region around the star where we suppress starlight and where we’re hoping to see exoplanets,” says Poberezhskiy.

Compared with current space-based coronagraphs, the system is expected to improve sensitivity to exoplanets against the glare of their host stars by a factor of up to 1,000, revealing planets that would have been far too faint to detect before.

Like Hubble and JWST, Roman also uses masks, patterned plates placed in the path of the light that are designed to block the photons that run into them. One tool in Roman’s mask arsenal is “silicon grass,” a thicket of microscopic spikes on some masks that can be used in certain configurations to absorb photons so they don’t bounce around the telescope and accidentally reach a detector.

Light entering the forest bounces deeper and deeper between the blades and gets trapped instead of reflecting back toward the camera. “Once the light gets into there, it never gets out,” Poberezhskiy says. The mirrors and masks form a succession of gates and hedges to guide as much of the preserved planetary light as possible toward the final detector.

Alien Jupiters

This elaborate setup could open a new chapter in the direct imaging of exoplanets. Nearly all exoplanets photographed so far are oversize youngsters that are nothing like the residents of our solar system: several times the mass of Jupiter, still glowing with the heat left over from their birth, and orbiting tens or hundreds of times farther from their star than the Earth is from the sun. This is because they are relatively easy to see. Their size, warmth, and distance from their parent star makes them shine brightly in infrared light, far away from the worst of the stellar glare.

Roman, however, could directly image a true Jupiter analogue—a planet similar to Jupiter in mass and circling a sunlike star a few times farther out than Earth is from our sun. Unlike the hot Jupiters we can see now, this one would be a much more mature gas giant like ours, primarily reflecting its parent star’s light after billions of years of cooling instead of heavily emitting its own.

Astronomers have been able to infer the existence of such planets from the gravitational wobble they impart to the star. Roman instead will collect starlight reflected from the planet itself. “We’re not looking at the star. We’re not looking at the effect of the planet on the star,” says Meredith MacGregor, a professor of astronomy at Johns Hopkins who has also secured an observing program. “We are actually looking at the planet, and that is super powerful.”

Once this instrument becomes available, it will become the scientists’ turn to do their jobs. “I’m honestly a little terrified about how we’re all going to deal with it, because I think it’s just so much data,” MacGregor says. “I think people will legitimately still be working on Roman data for decades.”

But don’t expect to see a 4K photo of an alien Jupiter in the coming months. Roman will not be able to resolve such a planet into a solid globe—at best, it will likely resemble a smattering of pixels. Still, that will be enough, MacGregor says, as Roman can then use the coronagraph to get information on the various wavelengths of light from the planet, which can tell astronomers about its atmospheric chemistry.

“You’re taking something that’s a point of light and turning it into an actual world,” she says, “because if you know that about its atmosphere, now you know something about the surface of the planet and the possibility of life being on that planet, right? So that’s a big step.”

During its first observations, scientists and engineers will see whether they can hold a star at the very center of the coronagraph’s masks, shape the mirrors, “dig” the dark doughnut (as Poberezhskiy describes it), and then maintain everything as the spacecraft moves through space and actively changes temperature.

The results will inform NASA’s proposed Habitable Worlds Observatory, the daydream of many an exoplanet astronomer, which will in theory be able to separate the light of an Earthlike planet from that of a sunlike star, over 10 billion times brighter.

Creager, who has worked on the instrument since 2018, is proud of the achievement: “Not too many people get to say, ‘I built something and it’s taking a picture of a planet that’s at a star that’s 50 light-years away or 100 light-years away.’” He imagines the moment he and his team will be able to look at the first image as it arrives: “Yes, we did that.” While the planet may show up only as a tiny dot, Roman’s achievement will be the darkness engineered around it.