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Planetary defense: How military and civil satellites are watching fireballs to help keep Earth safe from space rocks

It came from outer space, exploding high above the South Atlantic off the coast of Argentina.

That April 1 event — an incoming meteor, also termed a bolide — was observed by both U.S. space-based military and civil sensors.

Hush-hush U.S. government satellite sensors detected the speedy fireball cutting through our atmosphere. The object's brightness peaked at an altitude of nearly 60 miles (90.5 kilometers) over the South Atlantic.

That dazzling spectacle was also caught by the National Atmospheric and Oceanic Administration's GOES-E and Europe's Meteosat Third Generation (MTG) Imager-1 satellite. Those two independent spacecraft in geostationary orbit detected the bolide via onboard lightning imagers.

This skyfall show is among a number of recent episodes that spotlight the value of combining multi-sensor data to not only portray fireball dynamics but also to help appreciate human-caused space debris impacts, as well as strengthening planetary defense knowhow.

illustration of a satellite in space with the full disc of earth in the background

Hovering in a fixed position high above Earth's equator, the Meteosat Third Generation mission is designed to deliver a rapid stream of data for enhanced weather forecasting. Its Lightning Imager offers a completely new capability for European meteorological satellites, including bolide detection. (Image credit: ESA/Mlabspace)

Catastrophic fragmentation

Take, for instance, another extraterrestrial incident.

In this case, an April 24, 2025 fireball over south-central Alaska yielded one of the most densely recorded "seismoacoustic" datasets ever obtained for a nature-made bolide en route to busting up.

A network of 37 seismic stations, 16 single infrasound sensors, and four infrasound arrays recorded 30 ballistic and multiple fragmentation arrivals. All this was complemented by Doppler weather radar detections of falling meteorites and independent optical video observations.

Now, toss in for good measure yet another encounter.

A roughly 12-foot-wide (3.7 meters) space rock plowed through Earth's atmosphere over northwest Queensland, Australia, on May 20, 2023, accompanied by a raucous round of sonic booms. And U.S. government space-based sensors caught the fall.

Researchers later determined that the object underwent catastrophic fragmentation, producing one of the 20 most energetic events reported by NASA's Center for Near-Earth Object Studies (CNEOS) since 1988 and the most energetic seen over Australia. It was equivalent to the explosion of a 7.1-kiloton bomb.

illustration showing a map of south-central alaska with several dozen green and black dots scattered over the landscape

An April 24, 2025 fireball event over south-central Alaska. This illustration is a detection map showing a regional seismo-acoustic network in south-central and interior Alaska. Only stations with available data during the fireball event are shown. Green stations denote sensors with detections. (Image credit: Scamfer, L. T., et al.)

Location, time and estimated energy

"For many fireballs, U.S. Government detections reported through NASA's CNEOS database provide an important starting point by establishing that an event occurred and, in many cases, providing basic parameters such as location, time and estimated energy," explained Elizabeth Silber, a senior research and development physicist at the U.S. Department of Energy's Sandia National Laboratories in New Mexico.

"Civil and scientific observing systems can then add independent measurements that help refine and validate that initial characterization," said Silber.

CNEOS, which is based at the Jet Propulsion Laboratory in Southern California, is NASA's center for computing asteroid and comet orbits and their odds of striking Earth. CNEOS computes high-precision orbits for such objects in support of NASA's Planetary Defense Coordination Office.

Different and complementary information

"The Alaska event is an especially useful example, because it was not reported by U.S. Government sensors in the CNEOS database. In this case, the event was reconstructed almost entirely from civil and scientific observations," Silber told Space.com.

She said that the seismic and infrasound data constrained the trajectory and acoustic energy, the video provided independent optical information, and the weather radar detected material from the fireball falling to Earth.

"So, the real strength is that these systems provide different and complementary information," said Silber. "When a U.S. Government detection is available, civil data can independently validate it and add much more detail. When one is not available, as in this case [for Alaska], the civil networks can still provide a surprisingly complete reconstruction."

grid of four photos, each of which shows a fireball streaking through a night sky

The May 20, 2023 Queensland superbolide caught on camera by ground-based optical observations. These are selected frames from Australia's Paddys Green station showing the evolution of the event. Frame (a) displays the initial entry. Frames (b) and (c) illustrate the rapid increase in luminosity, leading to severe sensor saturation. Frame (d) shows the final stages of the trajectory. (Image credit: Elizabeth Silber, et al.)

Independent view

The Alaska study shows how valuable it is to put together diverse types of observations once an event has occurred, said Silber. Each measurement responds to a different part of the event.

"Seismic and infrasound sensors record the atmospheric shock waves and can constrain the trajectory, fragmentation and energy," she added. "Optical observations provide an independent view of the luminous flight. Doppler weather radar can detect surviving material after it has slowed and entered dark flight."

Bottom line: no single sensor tells you everything.

"Combining independent observations lets us move from simply knowing that an event occurred to determining how the object traveled through the atmosphere, where it fragmented, how much energy it released, and whether material may have survived to the ground," said Silber.

illustration of a satellite in earth orbit, with the sun in the background

Artist's rendering of NOAA's GOES East satellite in orbit. The spacecraft provides real-time mapping of lightning activity, among other duties. (Image credit: NOAA)

'Hard rain' is gonna fall

Researchers got pretty lucky with the April 1, 2026 event over the South Atlantic, according to NASA's Rob Landis, a planetary defense specialist: Two civilian spacecraft located at different locations in geosynchronous orbit allowed them to conduct a rather unique investigation of this bolide.

"With two civilian resources, we can actually discuss things more openly," Landis, who's now a visiting vehicle integration manager for the International Space Station at NASA's Johnson Space Center, told Space.com.

Lightning-watching instruments not designed for detecting bolides, he said, "afford the science community to discuss these events and these sensors in a forthright, open manner. These lightning imagers give us opportunistic bonus science for those who study the 'hard rain.'"

Landis said that, in his personal view, there's a lot of smaller stuff getting through the atmosphere.

"To the casual observer, these certainly produce wonderful natural fireworks and are mostly harmless," Landis said. But, he stressed, it's important to be able to distinguish between natural events and human-made ones.

"It would be a horrific tragedy if any nation responded to a natural event — if they misinterpret it as a preemptive strike," cautioned Landis.

a young man wearing a wide-brimmed hat kneels next to a metallic object in a desert landscape

Sandia intern Logan Scamfer checks data recorded by a ground sensor in Alaska. Scamfer works with Sandia physicist Elizabeth Silber, whose research focuses on using infrasound, a low-frequency sound too deep for people to hear, and seismic data to study meteors and other fast-moving objects in the atmosphere. (Image credit: Logan Scamfer)

Real-world tests

So, in the big picture, having collaborative, multiple and independent ways to observe atmospheric entries is of benefit to planetary defense thinkers.

"Planetary defense is not only about finding an object before it reaches Earth," Silber said. "It is also about understanding what happens during atmospheric entry — that is, how the object fragments, where it deposits its energy, how accurately we can reconstruct its trajectory and whether material survives to the ground."

Incoming events provide "real-world tests" of the methods and models used to answer those questions, said Silber.

Harkening back to the recent Alaska fireball fall, Silber said, was particularly valuable because it was unpredicted, yet the dense ground-based network allowed the trajectory and energetics to be reconstructed in considerable detail.

"From a planetary-defense perspective, that kind of redundancy is extremely useful. Space-based observations, seismic and infrasound networks, optical cameras, and weather radar each provide different information, and each has its own limitations," Silber said.

When several observation techniques are available, researchers can cross-check one another and produce a much more complete characterization of an event.

"That improves post-event situational awareness, helps validate physical models and strengthens our ability to interpret future atmospheric entries, whether they involve natural objects or artificial reentries," Silber concluded.

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NASA’s Swift space telescope is about to crash to Earth. Where will it fall?

Update for 2:45 p.m. ET on Nov. 4: NASA's Swift space telescope fell to Earth today at 7:39 a.m. EST (1239 GMT) over Indonesia. Read our story here.

NASA's Swift space telescope is expected to crash back to Earth in the next few days.

The Neil Gehrels Swift Observatory will reenter Earth's atmosphere in an uncontrolled fashion, after a robotic rescue mission failed to boost the scope to a higher orbit.

Swift launched to Earth orbit back in November 2004. Over the next two decades, it studied gamma-ray bursts — the most powerful explosions in the universe — and other cosmic objects and events using a trio of telescopes: a Burst Alert Telescope (BAT), an X-Ray Telescope (XRT), and its Ultraviolet/Optical Telescope (UVOT).

On Oct. 20, NASA reported that Swift's orbit had decayed to 171 miles (275 kilometers) above Earth and that the roughly 3,300-pound (1,500-kilogram) observatory was no longer able to compensate for the effects of the increased drag. It entered safe mode, followed by Swift's operations team at Pennsylvania State University sending a command to the spacecraft that effectively ended its operations ahead of its destructive and fiery nose-dive.

It's unclear at the moment exactly when and where Swift will plunge to Earth. But researchers definitely have their eyes peeled.

A surge of reentries

In physics fashion, for the most part, what goes up must come down — with more space hardware to follow.

Thanks to the growing surge in low Earth orbit constellations and technology refresh cycles, there are 10 times more objects reentering per year than there were just five years ago, said Darren McKnight, a senior technical fellow at LeoLabs, a company that keeps a watchful eye on what's going on above our planet.

"It is unfortunate that Swift was not 'reorbited,' but from a reentry hazard perspective it is a small portion of the stuff coming back in. The rub on this, of course, is that, while many people bemoan the reentry of more objects, I am much more upset about the rapid rate of abandoning massive objects above 400 miles [644 km]," McKnight told Space.com.

Swift will likely disintegrate sufficiently upon reentry to not pose a ground casualty hazard, McKnight said. However, the internal workings of the observatory's X-ray and optical telescope might survive, McKnight said.

Where in the world?

Similar in view is Dean Sladen, a quality manager and aerospace engineer at the U.K. precision-components supplier Accu Components.

"Once Swift falls to about 120 kilometers [75 miles], the end usually comes within a few minutes. The air in front of it heats up so much that the satellite will start to glow. Solar panels and antennas are typically the first to tear off, and at around 78 kilometers [48 miles], roughly eight times the height of a passing airliner, the main body breaks apart. Most of it will melt and vaporize," said Sladen.

While it isn't yet known exactly where any surviving pieces will land, Sladen noted that Swift's orbit only passes over a band within about 21 degrees of the equator.

"That band is mostly ocean, though it also crosses populated parts of Africa, South and Southeast Asia and Latin America," he said.

black and white diagram showing four views of a space telescope

A diagram depicting the makeup of the Swift space telescope. (Image credit: NASA/Goddard Space Flight Center)

Surviving leftovers

As for which parts are most likely to survive and reach ocean or ground, Sladen pointed out that most of Swift's body is aluminum, wiring and electronics, which melt away early in the reentry process. What reaches Earth is usually small, dense and heat-resistant, such as titanium, steel and glass.

"The most likely survivors are its six heavy reaction wheels, the spinning flywheels it used to aim itself, along with tougher telescope parts such as lenses and mirrors. Its mask of around 52,000 tiny lead tiles will almost certainly melt. Only a handful of small, scorched fragments are expected to make it down — nothing recognizable as a telescope," Sladen said.

Sladen said that, at the current time, it appears that no detailed risk assessment has been published for Swift's fall.

"However, this does not mean NASA has not done the work," said Sladen.

"NASA's own orbital debris requirements state that the risk of human casualty from surviving debris shall not exceed one in 10,000, so it is highly likely this work has been completed but not published," he told Space.com. "Personally, I believe it should be published, as NASA has done with previous satellites. The risk is almost certainly very small, but it would give people a clear, factual picture rather than guesswork."

several technicians wearing blue jumpsuits work on a boxy golden spacecraft inside a white-walled clean room

A pre-launch photo of the Swift Observatory. (Image credit: NASA/Goddard Space Flight Center)

Design for demise

Sladen added that there's far more focus on how a satellite's life ends these days than there was in the past.

"Many now carry enough propulsion to steer themselves into a remote stretch of ocean, or are built from materials designed to burn up completely, an approach called 'design for demise.' NASA and the European Space Agency limit the chance of anyone being hurt by a reentry to one in 10,000, and if a satellite can't meet that, it's expected to come down in a controlled way," said Sladen.

So, should people be worried about having a nasty run-in with Swift leftovers?

Sladen doesn't think so. NASA has said that harm to anyone on the ground is unlikely, and LeoLabs also describes the risk as very small. Most of the spacecraft will burn up, and any surviving pieces will most likely fall into the sea, he said.

"The real concern is the long-term trend. With more satellites being launched than ever, the number of uncontrolled reentries is growing, which is why designing satellites to come down safely matters more and more," Sladen concluded.

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It’s time to reassess the size of our solar system, scientists say

Two leading space scientists say there is a need to redefine the edge of the solar system by presenting a theory which states that measurements of the Milky Way's gravitational field, including its dark matter, redraws the sun's frontier.

That theory was put forward by Jim Green, former NASA chief scientist and past director of the space agency's Planetary Science Division, along with Ed Belbruno, a professor of mathematics at Yeshiva University and a senior research associate at Princeton University.

The solar system's gravitational frontier extends to nearly 3.8 light-years from the sun, they contend, roughly 241,000 astronomical units (AU), a distance that brings the "edge" of the solar system to within the same scale as the separation between neighboring stars. The edge of our solar system may be defined not by a sharp boundary, but by a "complex dance among forces, energies and trajectories," they write. Green and Belbruno recently made their case in the August 2026 issue of the magazine ROOM - the Space Journal of Asgardia.

Slow moving objects

Moreover, this theory claims that the gravitationally stable Solar Lagrange points L1 and L2 could form a type of "portal" that could funnel future interstellar visitors such as the recent comet 3I/ATLAS into the solar system, perhaps allowing scientists to capture them for future study.

"Discovering the solar-galactic center L1 location is important since slow moving objects that enter this region can be captured by our sun and become part of our solar system," Green told Space.com. "Who knows if there may be a large captured rogue planet on its way into the solar system right now," he said.

Green said there's a need to look at these newly calculated L1 and L2 locations to see what could be found. He is now in discussion about making such observations with the New Horizons spacecraft team that explored Pluto in 2015 and is now operating in the outer heliosphere.

"Even accumulated dust in this region could verify many of the calculations we have made including the extent of the dark matter in our galaxy," said Green.

a large yellow orb in the center, with a blue orb off to the side. a cross-shape of imaginary lines is superimposed on them

A diagram showing the Lagrange points L1 though L5. (Image credit: NASA Goddard Space Flight Center Scientific Visualization Studio)

Ballistic capture

"It's a really nice and significant result," Belbruno told Space.com. The ROOM article, written for a popular audience, draws from his August 2025 keynote lecture at the Niels Bohr Institute. Much of the theory also stems from Belbruno's work on permanent capture into the solar system and weak stability boundaries published in 2024 in the journal Celestial Mechanics and Dynamical Astronomy.

Belbruno authored the book Fly Me to the Moon: An Insider's Guide to the New Science of Space Travel (Princeton University Press, Princeton, 2007). In that work, he spells out how to harness low-fuel space travel he likens to "surfing the gravitational field."

"This new work represents a new application of weak stability boundary theory, first applied in 1987 to find new routes to Earth's moon, using ballistic capture for spacecraft," Belbruno said. "Now, its application is substantially extended to ballistic capture into our solar system from interstellar space and in estimating the size of our solar system," he said.

Green and Belbruno point out that the very recent discovery of interstellar objects  — such as interstellar comet 3I/ATLAS in 2025  — passing through our solar system on hyperbolic trajectories "has opened an entirely new window onto the material and processes shaping planetary systems across the galaxy."

A blue ball of light shines between streaks of blueish light from stars in outer space

Interstellar comet 3I/ATLAS as seen by the Hubble Space Telescope in August 2025 as it passed through our solar system. (Image credit: NASA/ESA/David Jewitt (UCLA)/ Image Processing: Joseph DePasquale (STScI))

Mastery of gravity

The article in ROOM adds some impactful ideas regarding potential distant alien civilizations.

"Interstellar travel requires a mastery of gravity, which an advanced extraterrestrial civilization might use to tour the galaxy, using portals created at Lagrange points for leverage, Green and Belbruno write.

"Remaining at these locations, they could observe the life within a stellar system with essentially no energy expenditure," the researchers add, "so perhaps we should be looking for large space stations at stellar L1 and L2 locations as a techno-signature of advanced intelligent life?"

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NASA’s SkyFall helicopters will ‘show us parts of Mars we’ve never seen before’, scientists say

NASA is accelerating the development of three helicopters that will be deployed into the sky above Mars after a voyage aboard NASA's Space Reactor‑1 Freedom spacecraft.

Slated for launch in 2028, SR-1 Freedom is the first fission nuclear-powered interplanetary spacecraft and is assigned the duty of dropping off the SkyFall entry capsule loaded with the trio of aerial vehicles at the Red Planet. SR-1's trajectory will deliver the SkyFall helicopters in Mars' northern hemisphere during the planet's spring season to avoid dust storms.

SkyFall is based on the success of the first aerial craft to float about the Red Planet, Ingenuity, which flew over 70 missions at Jezero Crater before it finally broke a rotor. It was designed to fly five. The SkyFall mission will consist of three identical helicopters to be deployed by an entry vehicle in the atmosphere, let loose at roughly under a mile (3,300 feet or 1,000 meters) above Mars, with each of the craft landing independently.

Regions of interest

The SkyFall mission is to conduct investigations that address objectives relevant for science and preparing for human exploration of Mars. Anticipated flights of the vehicles will travel outside of the landing ellipse to regions of interest within a broader exploration zone.

However, there are further science-focused flight paths and regions that have yet to be determined. NASA intends for the SkyFall helicopters to go to multiple regions of scientific interest on Mars.

NASA's Mars Exploration Program, along with the SkyFall project at the Jet Propulsion Laboratory (JPL), will work together to pick those "why and where" paths to navigate.

A first workshop on potential landing sites for the SkyFall mission and adjacent exploration zones of high scientific value is slated for early next year. And as always, sites and zones on Mars for the choppers means satisfying engineering constraints imposed by the project and spacecraft design.

Given the rapid development cadence of the SkyFall mission, decisions are to be fast-paced, but are geared to maximizing science value of the endeavor.

What Mars researchers are after will be a ranked list of potential landing sites that will be studied in more detail by the SkyFall project and science community, prior to a second workshop to be held in late 2027.

Notional flight trajectories

On the table are potential science value and notional flight trajectories of individual landing sites given the capabilities and payload of the SkyFall helicopters.

Landing site selection will occur after the back-to-back landing site workshops next year, said Matthew Golombek, SkyFall Project Scientist at JPL.

"The project has identified a design reference landing site that targets subsurface water ice deposits with glacial/periglacial terrains," Golombek told Space.com.

Given their deployment, how much real estate will the aerial vessel assault study?

Golombek said that the helicopters are capable of flying one to two kilometers every other sol, so flight traverses of 125 miles to a little over 185 miles (200-300 kilometers) are possible.

"The helicopters are designed to last 6 months, with a goal of one Earth year and each can fly every other sol so multiple flights are expected," Golombek added.

Thanks to the success of the Perseverance rover's unleashing of the Ingenuity rotorcraft, Golombek said that there are a host of lessons learned, as well as engineering additions to be made to the set of SkyFall vehicles.

a long rectangular spaceship in front of reddish orange planet

An illustration of NASA's nuclear-powered SR-1 Freedom spacecraft that will transport the agency's SkyFall helicopters to Mars. (Image credit: NEMES LASZLO/SCIENCE PHOTO LIBRARY/Getty Images/NASA)

Nominal payload

"Although the helicopters are slightly larger than Ingenuity, they are being designed to operate in exactly the same way, so all of the experience with Ingenuity operations will be directly relevant," said Golombek.

The nominal payload to be toted around the Red Planet will be identical for all three helicopters, consisting of five instruments, plus engineering navigation cameras. Those instruments are to investigate the subsurface structure of Mars, the geomorphology and geology of surface terrains, as well as look at the meteorology of the atmosphere and the radiation environment.

Although there is no dedicated hardware to directly measure winds, the helicopters themselves can serve as on-the-spot wind sensors, even shifting to "Balloon Mode," whereby a helicopter will drift in the background wind.

Radar love

Each low-flying helicopter is outfitted with a ground penetrating radar (GPR) instrument, one that can detect layering in the near surface, at depths unobservable by orbital radar.

Those layers could be assembled from rocky material, buried ice, or combinations of the two. Detection of near-surface ice is of interest both scientifically as well as in support of future human expeditions to Mars.

Subsurface ice not only preserves a record of past Martian climate but also serves as a "high-priority environment" that might have served as a habitat of past…or Martian life resident today.

A tiny helicopter drone has a small white cape.

NASA's SkyFall Mars helicopters will use cape-like ground penetrating radar (GPR) instruments to look under the Red Planet's surface. (Image credit: NASA/JPL-Caltech)

SkyFall maneuver

AeroVironment of Arlington, Virginia is partnering with JPL, selected last August to co-design and co-manufacture the SkyFall helicopters. They too are building on their experience as co‑developers of NASA's Ingenuity Mars helicopter that made those 72 flights at Jezero Crater on Mars.

"Now, with SkyFall, we're taking AV's high‑volume uncrewed systems mindset into planetary exploration and showing that Mars helicopters can be built as a repeatable product line, not a one‑off delivery," said Jeff Rodrian, Head of MacCready Works, AV's advanced research and development organization.

A special "SkyFall maneuver" is to be utilized in deploying the three aerial craft. They will be released directly from the carrier spacecraft into the Martian atmosphere, where they separate, deploy, descend, and land under their own power.

"By eliminating the need for a single-use lander stage or a host rover (as Ingenuity required with Perseverance), this approach significantly reduces the technical and financial risk of getting to the Martian surface," explains an AeroVironment statement.

NASA's SkyFall mission to Mars will release of a trio of helicopters on the Red Planet, if all goes to plan. (Image credit: NASA/JPL-Caltech)

Mountains of data

"Just like here on Earth, Mars helicopters can cover distance quickly and can go places that might be impossible to reach by ground," said Will Pomerantz, Head of Space Ventures at AeroVironment.

The science community may guide these helicopters to locations, Pomerantz said, where the ground penetrating radar can map out the specific spots of ice below the martian surface.

"The three SkyFall helicopters are going to show us parts of Mars we've never seen before and return mountains of data for scientists to pore over," said Pomerantz.

An illustration of AeroVironment's new "Skyfall" helicopter concept that could deploy six scouts to Mars. (Image credit: AeroVironment)

An illustration of AeroVironment's new "Skyfall" helicopter concept that could deploy six scouts to Mars. (Image credit: AeroVironment)
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Can we protect historic sites on the moon from the coming lunar rush?

The moon is a historical landmark — a celestial body continually peppered with robotic landers shot from our home planet, as well as human footprints planted there by a dozen visiting moonwalkers from 1969 to 1972.

A recent gathering in Italy of the International Scientific Committee on Aerospace Heritage (ISCAH) looked at protecting lunar heritage with an eye toward developing guidelines for spacecraft deorbiting onto the moon's surface.

Particular attention was paid to the risks posed by the impacts of deorbited satellites and rocket stages, recently highlighted by the crash of a SpaceX Falcon 9 upper stage into the moon last August.

As pointed out in the meeting, as lunar traffic increases, controlled crash landings of moon orbiters and rocket stages are becoming an attractive end-of-mission disposal strategy.

And that's a problem.

Limited knowledge

There is limited knowledge regarding ejecta modeling and the effects produced by these impacts, said Luca Forassiepi. He spoke at the Sept. 14 meeting in Piza, which was called "Protecting Lunar Heritage: Developing Guidelines and Recommendations for Controlled Lunar Deorbiting."

"These effects have only been observed, and only partially, in a handful of historical cases. As a result, much of our current understanding relies on simulations, which necessarily involve a number of simplifications compared with reality," Forassiepi told Space.com.

photo grid showing eight small images of impact craters on the moon

Examples of archaeological artifacts and features on the moon. (Image credit: Justin Holcomb et al)

Strong incentive

"Because the moon is an airless world, any movement on the surface is going to stir up sticky, abrasive dust that erodes human materials," pointed out associate professor Alice Gorman, an Australian archaeologist and heritage consultant at Flinders University.

"This is a problem for cultural heritage sites," Gorman said. "Imagine the iconic Apollo 11 landing module, the Eagle, being worn away until it crumbles into dust itself."

"It's also going to be a problem for habitation and mining installations," she added. "So there is a strong incentive for [the] space industry to minimize the impacts of rocket and satellite crashes, protecting both heritage places and new surface missions."

End-of-life planning

Gorman pointed to 51 hard spacecraft impacts on the moon to date, a number that includes nine rocket bodies and 19 lunar orbiters.

"We've reached an inflection point where spacecraft craters aren't just new archaeological sites, they're an environmental hazard that may cause irreversible damage," Gorman told Space.com.

Under the 1967 Outer Space Treaty, Gorman observed, nations are liable for any damage their space hardware causes to the property of other nations. "We could be looking at a situation where a state could demand compensation for a rocket body crash harming its cultural heritage. End-of-life planning is going to become critical."

image of a spherical spacecraft with four long straight antennas on the surface of the moon

The Soviet Union's robotic Luna 9 spacecraft made the first-ever soft landing on the moon in February 1966. (Image credit: Roscosmos/For All Moonkind Registry)

Cultural landscape

Also taking part in the meeting was Beth O'Leary, a cultural anthropology and archaeology specialist and college professor emerita at New Mexico State University in Las Cruces.

"The moon is part of the cultural landscape of Earth," she said. As such, its environment and heritage deserve international attention.

It's now been more than 60 years since the first successful soft landing on the moon, that of the Soviet Union's Luna 9 spacecraft in February 1966. And lunar traffic is poised to increase greatly in the coming years, as both the United States and China aim to build bases near the moon's south pole.

Given this landscape, "we seek to address the challenges of lunar traffic from crashes, deorbiting spacecraft, and intentional landings and to understand those risks to our aerospace heritage. Our committee attempts to estimate the real consequences of the impacts," O'Leary said.

With global experts in planetary geoarchaeology, site formation processes and heritage management, ISCAH is analyzing and increasing the knowledge base that could prevent the irreversible destruction of the significant historic cultural resources on the lunar surface.

Far-reaching consequences

"Our recommendations should inform consensus-based decisions and support international best practices and policies," said O'Leary.

The ongoing work of the group provides the best opportunities for lunar preservation and protection by and for humanity, she added.

"In our short three years," O'Leary said, "we will have had three conferences, created a mission statement, received World Monuments Fund listing, and will continue as a delegation to the United Nations Committee on the Peaceful Uses of Outer Space."

O'Leary told Space.com that all these issues are complex scientifically and legally, "but it is so important to rely on excellent research and proven heritage management principles in order to make good decisions about preservation which have far-reaching consequences."

Planetary geoarchaeology

One goal the group is addressing is a "post-mission gap," particularly regarding lunar projects.

That is, what happens to lunar heritage following the completion of a successful mission and in the decades that follow?

Also, what are the appropriate end-of-mission practices, and how can we ensure the long-term protection of spacecraft, robotics and other material remains associated with these missions?

Those questions are being deliberated by Justin Holcomb, an assistant research professor with the Kansas Geological Survey, a research unit of the University of Kansas in Lawrence.

Planetary geoarchaeology provides one way to address this issue, by identifying the natural (geological) and anthropogenic (human) processes operating within these environments "that may threaten lunar heritage, while also identifying environmental settings that are more conducive to its long-term preservation," Holcomb told Space.com.

Lunar practices

Forassiepi said that future points of action are on the agenda.

"There is certainly ongoing and continuous work by the ICOMOS International Scientific Committee on Aerospace Heritage on this aspect," said Forassiepi.

ICOMOS is the International Council on Monuments and Sites, a non-governmental organization working to conserve and protect cultural heritage sites on our planet — and off it as well.

"In active collaboration with the World Monuments Fund, we will further refine our research into the potential risks associated with deorbiting and crash landings," Forassiepi noted.

Over the coming months, Forassiepi said, the group will move into a second phase focused on listening and dialogue with all relevant stakeholders in the sector, from space agencies and the scientific community to private actors, heritage experts and communities with social and religious values associated with the moon that could be affected or disrupted by certain lunar practices.

photo of a small silver plaque on the dusty gray surface of the moon

The human touch: A commemorative plaque left at the Apollo 15 moon landing site that honors deceased NASA and Soviet cosmonauts, with a tiny figure of a fallen astronaut. (Image credit: NASA)

Ultimate goal

"The aim is to initiate an open dialogue and exchange among all these different actors, with a view to collectively developing guidelines based on broad consensus," Forassiepi said.

These will then be presented in the context of the United Nations Committee on the Peaceful Uses of Outer Space in 2027, with the hope that, over time, they may evolve into "internationally recognized standards of behavior" and be adopted and followed by all space actors, Forassiepi added.

"The ultimate goal is to build a lunar future that is sustainable not only from an operational perspective, but also in terms of scientific research and the protection of the earliest traces of human presence in the history of space," he stressed. "These are two irreplaceable forms of heritage, and their damage would represent an enormous loss for future generations."

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The US government is ‘sincere in its efforts to understand UAP’, new White House council chair says

Whatever they are and from where, UFOs, now known as Unidentified Anomalous Phenomena or UAP, are the subject of serious scrutiny at the highest levels of the U.S. government.

In June 2026, the White House established a new UAP Science Advisory Council in coordination with the Pentagon's All Domain Anomaly Resolution Office, the Office of the Director of National Intelligence and the FBI Deep diving into the UAP landscape is Avi Loeb, noted Harvard astrophysicist. He is also director of the Galileo Project at Harvard, which aims to search for signs of extraterrestrial activity here on Earth. As the council chair, Loeb said the goal of this group is to advise the U.S. government on how to resolve the nature of UAP.

Members of the UAP Science Advisory Council recently gathered at a private meeting, held on Aug. 31 at the Office of the Director of National Intelligence, Loeb told Space.com. "I cannot disclose the contents but I will say that the U.S. government is sincere in its efforts to understand UAP based on the scientific method of data collection," Loeb said.

Council membership

One of the council's members is Ben Lamm, co-founder and CEO of Colossal Biosciences. As a serial technology entrepreneur, he's no stranger to diving into complex challenges. Colossal is advancing the use of genome editing technology to "de-extinct" previously lost species such as the Wooly Mammoth.

Working along with the council's group of scientists and experts, Lamm is bullish about bringing clarity to a long-standing investigation and wonder of UAP.

"I've been fascinated by this topic for a long time, so having the opportunity to help examine the evidence firsthand and contribute to a serious scientific effort is incredibly exciting," Lamm told Space.com.

"Our mission is straightforward," Lamm added. "This is not about belief, it is about evidence. We want to apply rigorous scientific methods to both historical UAP records and new observations, collecting and analyzing data that meets today's scientific standards," he said.

Lamm said that the expectation is to bring transparency and accountability to the field by objectively evaluating credible evidence and sharing findings openly with the scientific community and the public.

"It's time to search for answers around the science because they could reshape our understanding of the world and, potentially, become one of the most significant discoveries in human history," said Lamm.

a man in a leather jacket and wolf t-shirt sits on a podium on a stage in front of a sign that reads 'sxsw london'

Ben Lamm at SXSW London 2025 on June 03, 2025 in London, England. (Image credit: Lorne Thomson/Redferns/Getty Images)

New polling data

Meanwhile, and serving as a backdrop to studying UAP, is a new Gallup poll, conducted in July. That poll found that about half of Americans, 49 percent, think all Unidentified Flying Object (UFO) sightings can be explained by human activity on Earth or natural phenomena.

The poll also found 37 percent believe at least some UFOs have been alien spacecraft visiting Earth from other planets or galaxies while another 13 percent do not have an opinion.

Interestingly, rather than becoming increasingly convinced that some sightings have been alien spacecraft, the percentage of Americans who are unsure has grown, from 7% in 2019 to 13% in 2026 the Gallup poll found.

black and white photo of a blurry, football-shaped object in the sky

A "football-shaped" UAP (unidentified anomalous phenomenon) observed by an infrared sensor on a U.S. military platform in 2024. The Pentagon released this observation on May 8, 2026. (Image credit: U.S. Deparment of War)

The new poll also notes that a majority say the U.S. government is withholding UFO information. Seventy-eight percent of Americans say the U.S. government knows more about UFOs than it is telling the public, higher than the 68 percent and 71 percent who said so in 2019 and 1996, respectively.

These findings come as the Department of War continues to release a mix of UFO files under a President Donald Trump executive order.

In August 2026, the UAP Science Advisory Council announced their support for the Trump administration to provide legal assurances, including immunity where necessary, for current or former government employees and military personnel to share information with the council "regarding alleged technology from a non-human origin and help guide the council's scientific evaluation."

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China on track to launch Mars sample-return mission in 2028: ‘If accurate, this represents a Sputnik moment’

China is making progress on its Tianwen 3 Mars sample return mission, which aims to bring back to Earth roughly 500 grams (17.6 ounces) of Red Planet collectibles in 2031.

According to the China National Space Administration, the Tianwen 3 mission will have a lander, an ascender, a service capsule, an orbiter and an Earth reentry module.

If all goes to plan, Tianwen 3 will launch in 2028 on two Long March 5 heavy-lift rockets from the Wenchang Space Launch Site on the island of Hainan, China's southernmost province.

Sputnik moment

"The Tianwen 3 mission is progressing smoothly, with intensified efforts being made to overcome technical challenges," Hou Zengqian, the mission's chief scientist, recently told CCTV, a state-run Chinese broadcaster.

"The probe equipment has entered the prototype development phase, and scientifically, many scientist teams from across the country are working together to tackle the challenges in accordance with the mission's scientific objectives," Hou added.

Meanwhile, NASA's plans for hauling Mars samples to Earth are murky at the moment. So China appears to be in the lead to notch a major space milestone.

"If accurate, this represents a Sputnik moment," said former NASA "Mars Czar" Scott Hubbard, referring to the reported Tianwen 3 progress.

"China will not only grab the headlines but may be the first to find evidence of life on another planet," Hubbard, who also previously directed NASA's Ames Research Center in Silicon Valley, told Space.com.

diagram showing a spacecraft's route to from earth to mars and back again

Diagram of China's Tianwen 3 Mars sample return mission. (Image credit: The University of Hong Kong/Zengqian Hou, et al.)

Top scientific priority

"The Tianwen 3 mission will look for microbial traces potentially similar to early forms of life on Earth, while also taking into consideration the possibility of unknown forms of life that may have emerged through Mars' unique evolutionary history, providing crucial evidence to answer this major scientific question," Hou told the state-run Xinhua news agency in a recent interview.

Searching for potential signs of life on Mars is the top scientific goal of the Tianwen 3 mission, Hou said on Sept. 3 during the 2026 International Deep Space Exploration Conference on, which was held in Hefei, the capital of eastern China's Anhui Province.

Landing site

China's Mars sample-return trek will be launched "around 2028" on two Long March 5 rockets departing from the Wenchang Space Launch Site in China's southernmost island province of Hainan. (Launch windows for Mars missions come around just once every 26 months. The next one opens in November-December of this year, and the one after that, which Tianwen 3 apparently is targeting, runs from December 2028 to January 2029.)

Hou also said China expects to finalize the landing site for the mission by the end of 2026, with Chinese specialists advancing work on a next-generation geological map of Mars in its entirety.

If everything goes according to plan, the mission will collect samples from the Martian surface and then send them back to Earth around 2031.

"Regardless of whether signs of life are found, the returned Martian samples will have irreplaceable scientific value," Hou said.

Tackle the challenges

Hou added that analyses of the returned samples at microscopic, molecular and isotopic scales could deepen our understanding of Mars' geology and environment, as well as the evolution of habitability and the conditions under which life may originate.

According to Hou, Mars sample return is an extremely complex project, with landing-site selection, planetary protection and contamination control, and the identification of potential signs of life among its key challenges.

Chinese Mars researchers are selecting candidate landing sites for the mission based on factors that include geological age, history of water activity, habitability and the potential for preserving biosignatures.

Planetary protection lab

Xinhua reported last month that a "planetary protection laboratory" is to be built in the first phase of Hefei's Deep-Space Science City in east China's Anhui Province, citing the Deep Space Exploration Laboratory (DSEL).

"The planetary protection laboratory will implement a two-way protection system that guards both the returning Martian samples and Earth's biosphere," Xinhua reports.

The lab's tasks encompass sample sterilization, unsealing, processing and biological risk assessment. "The facility is designed to support the implementation of major deep-space missions and to enable scientific research on Martian samples," added Xinhua.

China "will follow the planetary protection policies of the Committee on Space Research, to prevent biological contamination of Mars by terrestrial organisms and to protect Earth from any potential extraterrestrial life forms that may be carried back in the samples," said Li Hang, director of the development planning department at DSEL, according to Xinhua.

You can view a video about China's Mars sample return plans here.

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The future of Earth observation: Private satellites and AI bring benefits but also pose risks

We are a planet-based species: With a few notable (astronaut) exceptions, everyone who has ever lived remained glued to our spinning Earth, which now houses 8.3 billion people.

That's the gravity of the situation. But we're also a world of floods, typhoons, earthquakes, heat and cold calamities, volcanic eruptions and even encounters with sun-caused auroras and bruises from incoming asteroids.

It's quite a world worth watching — and for decades that's what spacecraft have been doing. But what do they view and who's on the other end of the space-based telescopes capturing our daily doings, faults and all, down here on terra firma?

long-distance view of earth in deep space

The U.S. government's Deep Space Climate Observatory (DSCOVR) satellite captured its first view of the entire sunlit side of Earth from one million miles away on July 6, 2015. (Image credit: NASA)

Privacy, security and trust

Recently, the Organization for Economic Co-operation and Development (OECD), a group based in Paris, published a report on the expanding access to satellite Earth-observation data, spotlighting what it means for privacy, security and trust.

"Advances in optical systems, photonics, cloud computing and artificial intelligence [AI] have democratized both the quality and accessibility of satellite data. However, this convergence of technologies also carries risks, including for national security and privacy," states the report, which was authored by the OECD's Marit Undseth and Claire Jolly.

Broadening access to advanced satellite data also creates new challenges, states the report, such as one of the key characteristics of Earth observation — its dual-use nature. "The same satellites used to track illegal fishing can often also detect military troop movements," the authors write.

Illustration of a satellite studying Earth, with orange and blue beams representing its data-gathering work

Illustration of a USGS-NASA Landsat remote-sensing satellite studying Earth. Government satellites the Landsat line were once the only craft doing such work. (Image credit: NASA)

New concerns

The OCED report notes that Earth-observation data and the technological convergence with artificial intelligence raise new concerns about national security, privacy and the ethical use of these data.

In fact, the report points to the growing hazard of fake or incorrectly used satellite imagery. "As part of the growing trend of digital disinformation, the trust in satellite data can be eroded by fake, misinterpreted or intentionally misrepresented imagery," it states.

Space.com asked leading remote-sensing specialists what's being done, what's being learned and what we should worry about.

Sovereignty and cost efficiency

Viktor Stoyanov is the chief operating officer of Smart Solutions at Space42, where he oversees the business unit's operational and financial performance.

Space42 is a United Arab Emirates-based space technology company that integrates satellite communications, geospatial analytics and AI capabilities. The group runs the Foresight Earth Observation constellation of synthetic aperture radar (SAR) satellites.

Space.com asked Stoyanov about the growing international use of remote-sensing data.

"Governments increasingly expect Earth-observation systems to deliver both sovereignty and cost efficiency, two goals that were long seen as mutually exclusive, as sovereignty typically meant heavy in-country investment in duplicative research and development and capital infrastructure," he responded.

Dual use

Stoyanov said Space42's focus is to combine those two outcomes.

"We believe that can only be achieved through international cooperation. Our Foresight constellation reflects this model, as the first sovereign dual-use synthetic aperture radar constellation in the region," Stoyanov said.

The satellites were manufactured in partnership with ICEYE in Finland, with critical integration and testing completed in the organization's facility in Abu Dhabi.

"The Abu Dhabi facility was built in cost-cautious and scalable manner, so that it can satisfy current sovereignty requirements commensurate with the constellation size, with the ability to expand the facility and meet demand of future programs," Stoyanov said.

Through cloud, dust and darkness

What new in-orbit technologies are being applied to Earth observation?

"The biggest shift in recent years has been the move from few, large, general-purpose platforms to constellations of small, specialized satellites and synthetic aperture radar," said Stoyanov.

"SAR satellites image through cloud, dust and darkness, which matters enormously for our region and for any customer who needs consistency regardless of timing and weather," he added.

Looking ahead, Stoyanov said that the short lifespan of satellites in low Earth orbit is an opportunity to ensure that each replenishment cycle becomes an upgrade cycle.

"As we plan to maintain and expand our fleet, we will continuously seek to deploy technical improvements across various performance metrics of the system — resolution, latency, satellite life, for example," said Stoyanov.

Artificial intelligence

A SAR constellation generates far more imagery than analysts can review manually within the allocated time, Stoyanov said. So the value lies in what can be extracted from it, not in the pixels themselves.

AI is therefore becoming increasingly important as a sorting tool for remote-sensing data, Stoyanov said. It is now the only practical way to work, for three reasons: volume, speed and accuracy.

Customers responding to a flood, a maritime incident or a supply-chain disruption need an answer in minutes, not a report next week — "decision-grade intelligence within minutes," explained Stoyanov.

On the topic of accuracy, while trained analysts are excellent at interpretation and large-object classification — like buildings and sea vessels — there are changes that the eye can easily miss. "Algorithms comparing each new pass against the historical baseline — they catch those consistently, without fatigue," said Stoyanov.

satellite photo of a dark plume of smoke ascending from a blue and red circular launch pad in a desert landscape

A SkySat Earth-observation satellite operated by the California company Planet spotted the wreckage of a failed launch out of Iran's Imam Khomeini Space Center on Aug. 29, 2019. (Image credit: Planet Labs, Inc.)

Hybrid model

Francis Doumet is the CEO and co-founder of Metaspectral, a company based in Vancouver, British Columbia, that builds AI technology to rapidly analyze hyperspectral imagery.

Doumet views collaboration between different national space agencies as "extensive and, somewhat uniquely, very open." Missions are frequently carried out through "shared funding, instruments, expertise and ground infrastructure," he said, with the resulting scientific data made available internationally.

Commercial imagery is less openly distributed because it is commercially licensed and may have security implications, Doumet said, but it is increasingly enabling international cooperation in the defense sector.

For example, the U.S. Space Force's Tactical Surveillance, Reconnaissance and Tracking (TacSRT) program combines commercial satellite imagery and analytics from American companies and allied nations to rapidly respond to operational requests, Doumet said.

"This has shaped the Earth-observation sector into a hybrid model," said Doumet. Governments and allies share requirements and intelligence, he explained, while commercial operators supply imagery and analytics "at a speed and scale that would be difficult or impossible for a single nation to produce alone."

illustration of a white, boxy satellite high above earth

Artist's illustration of Planet's Pelican-2 Earth-observing satellite in orbit. (Image credit: Planet Labs PBC)

Hyperspectral sensors

The improvement in the spatial resolution of hyperspectral sensors is an important advance in Earth observation, Doumet pointed out.

Better sensors, high-speed compression and improved communications, such as optical links, are now narrowing a "resolution gap." Onboard AI is equally transformative, he added.

"Satellites can analyze imagery in real time, identify relevant signatures and transmit alerts or compact intelligence products instead of waiting to download an entire hyperspectral data cube," Doumet explained.

Spectral fingerprints

Angie Crews is a principal research associate with the University of Colorado, Boulder's Center for National Security Initiatives.

"There has been a tremendous growth in the commercial remote-sensing industry," Crews told Space.com, noting that this field had previously been government-based. "It's now possible for these commercial companies to deploy entire constellations of Earth-observing satellites, which fundamentally changes the architecture in place."

Crews pointed to the hyperspectral nature of Earth remote sensing — taking the "spectral fingerprints" of what's occurring on Earth.

"It's impressive how the industry is moving forward with some of these capabilities," she said.

Balancing act

"There are some tremendous benefits as well as some things that we need to think about" when it comes to the new direction that Earth observation is taking, Crews said. Remote-sensing data can be inherently dual use, she added.

"Overall, I think we're seeing some enormous benefits from our increasingly capable commercial remote-sensing systems. But it does raise some security and governance questions," said Crews.

It's a balancing act to manage, according to Crews. How best to secure the information for national security purposes versus not putting the squeeze on innovation exhibited by the private Earth-observation firms?

Meaningful information

Shifting to her teaching role at the University of Colorado, Boulder, Crews told Space.com that one of the things that's especially important is to train students in the remote-sensing field to think beyond any single sensor or dataset.

"The next generation needs to understand how different sensing technologies work and also how to work with very large datasets and extract meaningful information using AI and machine learning," Crews said.

"We also need to train the students on critical thinking and ensure they are aware of the limitations of AI. The underlying physics need to be understood and the results need to be validated so that the students use and interpret the results appropriately," she concluded.