Raw Images from Vera Rubin Reveal Something Unexpected

Added: 2026-05-28

[00:00:00]On the 2nd of April 2026, the Vera C.

[00:00:03]Rubin Observatory team made an announcement that quietly broke a record more than two centuries in the making.

[00:00:09]They had submitted a data set to the International Astronomical Union's minor planet center. The global clearing house for every asteroid, comet, and rocky fragment ever cataloged in our solar system. Inside that submission were approximately 1 million individual observations. Tracked across those observations were just over 90,000 objects. Of those, roughly 80,000 were already known. Asteroids whose orbits had been mapped sometimes decades ago, sometimes only weeks. A handful had even been lost, seen once, and then drifted out of the predictive reach of human telescopes because their orbits were too uncertain to follow. But it was the rest of the data set that stopped everyone.

[00:00:49]11,000 of the objects in that submission had never been seen before. Not by any telescope on any night, in any survey.

[00:00:57]They were new entries in the solar systems catalog added in a single batch.

[00:01:01]For context, every groundbased and space-based asteroid survey on Earth, working in combination, discovers about 20,000 new asteroids in a year. The Reuben Observatory had submitted more than half that annual global total in one submission drawn from a single observing campaign. And then came the part that made the rest of the astronomy community sit up. The data hadn't been gathered for over a year. It hadn't even been gathered during Reubin's official scientific survey, the 10-year legacy survey of space and time that the observatory was built to carry out. It had been gathered over roughly a month and a half in the summer of 2025 during something the team called the early optimization surveys, a critical phase of system commissioning, a test run, engineering data. The observatory wasn't even officially online yet. It was warming up. The submission was confirmed by the minor planet center to be the single largest batch of asteroid discoveries submitted in the past year anywhere in the world. Mario Jurich, the University of Washington astronomer who leads Reubin's solar system science effort, put it as plainly as it can be put. He called the submission the tip of the iceberg. That phrase deserves to sit for a moment because if 11,000 new asteroids found during a warm-up phase is the tip, what is the rest of the iceberg shaped like? How is this even possible? What kind of instrument sitting on what kind of mountain can pull in 11,000 previously invisible worlds across 6 weeks of preliminary observation?

[00:02:36]The answer begins in northern Chile on a ridge in the Andes called Cherro Pachchon, 2,647 m above sea level. The air here is thin, dry, and almost completely cloudless on most nights of the year. It is one of the best patches of sky on Earth from which to observe the cosmos. On that ridge stands an 18-story building shaped roughly like a silo. And inside the silo, mounted on a platform that can pivot the entire upper structure, sits a telescope called the Simony Survey Telescope. The primary mirror of that telescope is 8.4 m across. The light from a distant asteroid hits that mirror, bounces to a smaller secondary mirror suspended above it, then bounces back down through a clever third reflective surface built into the main mirror itself. The design is called a three mirror anastigma. What it does in practical terms is keep the image sharp across an unusually wide field of view.

[00:03:30]Most large telescopes can deliver either depth or width. This one does both.

[00:03:34]Mounted at the point where all that folded light finally comes to focus is the part of the instrument that has reshaped what is possible. It is a digital camera and it weighs roughly 3,000 kg. It is the size of a small car by a clear margin. It is the largest digital camera ever built. Inside Edit, 189 charge coupled device sensors are arranged into 21 small grids called rafts. And together they form a single focal plane that captures images at a resolution of 3.2 gigapixels. To display one of those images at full size, you would need a wall of roughly 400 ultra highdefinition televisions running side by side. The width of what the camera sees in a single frame is part of what makes the whole system work. Each Reuben exposure covers around 9.6 6 square° of sky which is roughly 45 times the area of the full moon. Six different color filters slide in and out of the light path covering ultraviolet the full visible spectrum and into the near infrared. So the same patch of sky can be photographed in several wavelengths across a single night. Then there is the speed. A traditional research telescope when it needs to repoint to a new target takes around 10 minutes to swing, settle and refocus. Ribbon can do the same in roughly 5 seconds. The whole structure is engineered to move that quickly and that precisely without losing optical alignment. It is built to keep shooting.

[00:05:00]And because the mirror is so wide and the camera so refined, Reuben can survey the southern sky with roughly five times the sensitivity of most current asteroid surveys. That figure deserves slowing down on. It means Reuben can see objects five times fainter than what the existing global survey network can pick out. Smaller rocks, more distant ones.

[00:05:22]Asteroids that have always been drifting across the same sky every other telescope was pointed at, just too dim to register on any of them. Each clear night, the observatory generates around 20 terabytes of raw data. Reuben will collect more data in its first year than every other telescope on Earth has gathered in decades. All the raw data flows into a giant pipeline where it is cleaned, stitched together, and scanned for anomalies. The alert system then issues millions of automated notifications per night. Each one highlighting something in the sky that has moved, brightened, faded, or appeared for the first time. These alerts are broadcast in near real time to downstream brokers and follow-up telescopes worldwide. This rapid automated response turns the night sky into a dynamic, continuously monitored system rather than a static snapshot. In this sense, Reuben functions less like a traditional observatory and more like a global sensory organ. Not merely observing the sky, but relaying what it notices to a distributed network of instruments capable of responding.

[00:06:26]Artificial intelligence, essential for pattern recognition, sifts through the vast data set to identify changes among billions of objects and trigger timely follow-up observations. This is the machine. The question now becomes what it has actually been showing us.

[00:06:46]The first time the world saw what this telescope could do was on the 23rd of June 2025 at a release event held simultaneously in Washington DC, Chile, and at hundreds of watch parties across the globe. The images shown that day were not promotional renders. They were real frames taken with the LSST camera during about 10 hours of test observations on the mountain. One of the first images released was a composite of the Trifid Nebula and the Lagoon Nebula, two clouds of gas and dust several thousand light-years away in the constellation Sagittarius. The composite was assembled from 678 separate exposures taken across just over 7 hours. Even individually, the exposures were extraordinarily deep. Stacked together, they pulled out faint structures inside the nebula that had never been resolved in a single data set before. The result was a single frame that contained more detail than many older telescopes have managed to record across years of dedicated work. A second release showed a wide field view of the Virgo cluster, the dense group of galaxies that sits about 65 million lighty years from our own. In a single composite, the Reuben imagery captured something close to 10 million galaxies, ranging from large spirals near the cluster's heart down to small faint companions scattered across the surrounding sky. The visual is genuinely difficult to process at first glance.

[00:08:08]What looks at first like a starfield is on closer inspection almost entirely galaxies. Each tiny dot a separate island of hundreds of billions of stars.

[00:08:18]But the discovery that mattered most for the announcement that would come 9 months later was tucked inside the same 10 hours of test observations. In that single short observing window before any official survey had begun, Reuben had identified 2,14 previously unknown asteroids, seven of which were near Earth objects. To put a frame around that number, an earlier engineering test run in late 2024 using the smaller commissioning camera had picked up 73 asteroids. The June 2025 first look multiplied that by nearly 30 times. The April 2026 announcement arrived with its own visualizations, and these were the ones that did the heaviest lifting in conveying what had happened. The headline animation showed a model of the inner solar system. Every previously known asteroid was rendered as a dark blue point. Every new Reuben discovery was rendered in light teal.

[00:09:14]The teal points did not appear scattered randomly. They formed narrow fanned rays radiating outward because each ray traced the line of sight along which Reubin had been observing on a given night. Where the telescope looked, new asteroids appeared. A second chart showed the orbital distribution of all 11,097 new discoveries, most clustered tightly in the main belt between Mars and Jupiter, exactly where solar system models predicted they should be. But woven through that dense cluster were visible empty bands. Those bands are known as the Kirkwood gaps, regions where Jupiter's gravity has tugged asteroids out of stable orbits over billions of years. Reuben's data resolved them cleanly in a single submission on the first attempt.

[00:09:59]Underneath all of this sat the actual structure of the data itself, 1 million individual observations. Each one a position, a brightness, a timestamp.

[00:10:08]Software threaded those points together into orbits, matched them against the known catalog, and flagged the rest as new. 11,000 of them were new. And to feel the weight of that, it helps to look at what asteroid hunting used to be.

[00:10:26]On the 1st of January 1801, an Italian astronomer named Jeppi Piazi working at an observatory in Palmo noticed a faint point of light that had moved slightly against the background stars from one night to the next. He thought at first that he had found a comet. Over the following weeks, as he tracked the object's path, it became clear that what he was looking at was something new. It was orbiting the sun in roughly the right place for a planet, but it was small. He named it series. That object, the first asteroid ever identified, opened the catalog that astronomers have been building ever since. For most of the century and a half that followed, asteroid hunting was painstaking work.

[00:11:04]Astronomers would expose long photographic plates of the night sky, then return weeks later and expose the same patch again. Any object that had shifted position between the two plates was a candidate. Researchers compared the plates by eye, sometimes under specialized optical instruments designed to reveal tiny displacements. Each new asteroid was the product of patient human labor, often spread across months of observation and comparison. The work began to accelerate in the 1980s and 1990s when astronomy moved away from photographic plates and onto charge coupled devices. The same kind of digital light sensors that eventually went into ordinary cameras. With digital images came software that could compare frames automatically, flagging any point of light that had moved. Dedicated survey programs followed. Spacewatch in Arizona was an early pioneer. Then came Linear, run by MIT's Lincoln Laboratory in New Mexico, and the Catalina Sky Survey, also in Arizona, which would eventually become one of the most productive asteroid finding programs in history. The 2000s and 2010s saw a further acceleration. The Pan Stars telescope on Maui scanned the sky in repeated wide field sweeps. The Atlas network designed to give early warning of small impactors added its own steady stream of discoveries. The Neoise Space Telescope picked up asteroids in the infrared, catching objects that reflected little visible light. Neoise's infrared sensitivity was particularly valuable because it measured thermal emission from asteroid surfaces directly, allowing more reliable size estimates than reflected visible light alone. In visible light, a bright asteroid could be either large or simply highly reflective. But in infrared, scientists can separate an asteroid's true size from its surface reflectivity.

[00:12:51]This distinction is essential for accurate risk assessment. That is critical for planetary defense because an asteroid that appears bright does not necessarily mean it is dangerous and a dark asteroid could actually be much larger than it appears. Rather than replacing one another, these survey systems worked together. Each one covered weaknesses the others could not, creating a far more complete picture of the asteroid population around Earth.

[00:13:17]Together, all of these surveys, working in coordination across both hemispheres and across both ground and space, discover roughly 20,000 new asteroids in a year. That is the combined output of the entire global asteroid hunting effort. By the time Reuben began its preliminary test observations in 2025, the total catalog of known asteroids built up across more than two centuries of work sat at roughly 1.5 million objects. Every one of them had been earned slowly by someone. And then across 6 weeks of warm-up data, a single observatory in Chile added 11,000 more.

[00:13:59]The 11,000 new objects in the submission were not in any meaningful sense the same kind of thing. They lived in different parts of the solar system on different kinds of orbits and they would tell scientists different stories once their paths were mapped in detail. The bulk of them by a wide margin were main belt asteroids. 10,279 of the new discoveries sat in the dense Taurus of rocky bodies that orbits the sun between Mars and Jupiter. The main belt is the most heavily populated reservoir of small bodies in the inner solar system. And most asteroid surveys spend most of their time finding more of them. Another 234 sat in the outer main belt near the edge of that region and 103 were Mars crosses. Asteroids whose orbits dip close enough to the inner planets that they cross the path of Mars on every loop around the sun. Closer to home, the data set contained 33 near-earth asteroids. The naming convention for these is borrowed from the orbits of representative early discoveries. 27 of the new ones were Elmor, which orbit between the Earth and Mars without crossing Earth's path. Five were Apollo, which crossed Earth's orbit. One was an A 10, an inner orbit type that spends most of its time closer to the sun than Earth and only occasionally swings out past us. The implications of those 33 are significant enough to deserve their own section, which is where this script will go next.

[00:15:20]Further out, 57 Jupiter coupled comets turned up in the data along with seven cents, the small icy bodies that orbit between Jupiter and Neptune on unstable planet crossing paths. There was a single new Jupiter Trojan, one of the asteroids that share Jupiter's orbital path and travel in stable points ahead of and behind the planet. There were three new Neptune Trojans, the same kind of object, but locked into Neptune's orbital resonance instead. And then at the far end, 380 trans Neptunian objects. Those will come back later in this script because two of them are doing something very strange. There was also a quieter discovery buried in the same data set, one that does not show up in the headline numbers. Among the 80,000 already known asteroids that Reuben reobserved were several that had effectively been lost to science. They had been spotted once, sometimes long ago, but their orbits had not been mapped accurately enough to predict where they would be on any future night.

[00:16:19]Reuben's data was deep enough to recover them. By tracing those orbits backwards in time, researchers at the minor planet center could place each of those rediscovered objects in the right spot on the right historical night and confirm that they were the same bodies originally seen. Objects that had been drifting through the catalog as question marks were now back on the map. None of this would have been possible without new software. The asteroid discovery pipeline that processed Reubin's preliminary data was built by Ariins, a research scientist at the University of Washington, working with graduate student Jacob Kurlander. The system was designed from scratch because Reubin's observing cadence is unlike anything previous surveys have produced. A separate pipeline for picking the most distant objects out of the same data was led by Matthew Hullman of the Harvard and Smithsonian Center for Astrophysics, who is also the former director of the Minor Planet Center itself. What that combined effort pulled out of the data is most consequential for life on Earth in the 33 nearest objects.

[00:17:26]What does it actually mean to say that 33 of the new asteroids are coming closer? The phrase is a useful shorthand, but it carries a lot inside it, and most of what it carries is reassuring. A near-Earth object in the formal sense is any asteroid or comet whose closest approach to the sun brings it within 1.3 astronomical units of our star. An astronomical unit is the average distance from the Earth to the Sun. So, an object's perihelion at 1.3 astronomical units sits a little beyond the orbit of Mars. By that definition, most of the 33 new bodies in this submission do not come anywhere near Earth on their current paths. They merely live in a region of the solar system close enough to be classified, watched, and tracked. None of the 33 newly discovered near-Earth objects poses a threat to Earth. The largest of them measures about 500 m across, which is roughly the length of five city blocks. The rest are smaller. Their orbits have been calculated, refined against the million observation data set Reuben submitted, and confirmed to keep them at safe distances from our planet for the foreseeable future. The reason they matter is not what these particular 33 will do. The reason they matter is what their existence implies about the ones we have not yet found. Astronomers have a working size threshold for what counts as a regionally dangerous asteroid. That threshold sits at 140 m in diameter, which is about the length of a typical city block. A rock that size hitting the Earth would not threaten the survival of the species, but it would release energy equivalent to a major nuclear weapon capable of devastating an area roughly the size of a small country. The damage would not be planetary. It would be regional and it would be unprecedented in modern history. In 2005, the United States Congress passed a piece of legislation called the George E. Brown Jr.

[00:19:19]Near-Earth Object Survey Act. The law directed NASA to find, track, and catalog at least 90% of all near-earth objects 140 m or larger by the year 2020. The legislators set a deadline.

[00:19:34]The deadline arrived. The target was missed. The most recent peer-reviewed estimate published by a team led by Amy Mser in 2023 places the current completeness of the near-Earth object catalog at that 140 m threshold at about 38%. NASA's own communications placed the number at around 40%. Both of those figures are statements of the same uncomfortable fact that the Earth still has a significant blind spot. Roughly six out of every 10 dangerous midsized asteroids in our cosmic neighborhood are still unknown to us. They are out there on orbits no telescope has yet mapped, and we have no current census of where they are or when they will next approach. This unseen population represents a critical uncertainty in our planetary risk assessment. The statistical weight of that gap is worth pressing on. A gap in the catalog is not merely an intellectual inconvenience. It is a gap in the planetary risk model.

[00:20:28]This is the gap Reubin was built to close. Detailed simulations of the full 10-year legacy survey of space and time.

[00:20:36]run with software called Sorcerer and published in 2025 by a team led by Meg Schwam at Queens University Belfast and Matthew Hullman at the Center for Astrophysics predict that Reubin will identify somewhere between 89,000 and 127,000 new near-Earth objects across the decade. More importantly, the same simulation suggests that Reubin will catalog more than 70% of the potentially hazardous bodies above the 140 m threshold. Combined with what previous surveys have already found, that would bring the overall catalog close to the original congressional target, two decades after it was supposed to have been met. The completeness that Reubin is expected to achieve would be transformative, not just for hazard assessment, but for the broader science of planetary defense. NASA's planetary defense mission, double asteroid redirection test, DART, demonstrated that we can deflect an asteroid, but only if we already know it exists.

[00:21:33]Without a comprehensive catalog, even the most advanced deflection technology remains limited to a small fraction of the actual threat population. The catalog Reuben is building is the prerequisite for every mission like it that may follow. 33 is a small number to anchor a story about planetary defense.

[00:21:51]But it is also a sample. It is the early signal that something fundamental is about to change in how completely we understand the solar system we live in.

[00:22:00]And the most extreme signal of that change is sitting at the very far edge of the same data set.

[00:22:10]For most of the history of solar system astronomy, the region beyond Neptune was a blank space. Pluto, discovered in 1930, was treated as the lonely outpost of the outer system for more than six decades. The picture only began to fill in during the 1990s when the first true trans neptunian objects, TNOs, were found and confirmed. Over the three decades that followed, patient survey work by astronomers around the world added roughly 5,000 of these distant icy bodies to the catalog. In a single submission of preliminary Reuben data, 380 more were added in 6 weeks. Two of them are doing something unusual enough to deserve their own attention. They are provisionally designated 2025 LS2 and 2025 MX348 and both travel on extremely elongated orbits. The technical measure of how stretched an orbit is its eccentricity sits above 0.9 for both objects. A perfectly circular orbit has an eccentricity of zero. A parabolic barely bound trajectory approaches one. These two are very near that upper boundary.

[00:23:16]At their furthest points from the sun, each of these bodies reaches roughly 1,000 astronomical units. To picture that, the Earth orbits the Sun at one astronomical unit. Neptune sits at about 30. Voyager 1, which left Earth in 1977 and is the most distant humanmade object in existence, has traveled roughly 165 astronomical units. The aphilia of 2025 LS2 and 2025 MX348 sit six times further from the sun than Voyager has managed in nearly half a century. Both objects rank among the 30 most distant minor planets ever found.

[00:23:53]Finding them was not straightforward.

[00:23:55]Matthew Hullman, who led the Trans Neptunian Discovery Pipeline, has described the work as searching for a needle in a field of hay stacks. The faintest TN Os barely register against a sky packed with the light of more distant stars and galaxies. Picking one out requires watching it move very slowly over many nights and threading thousands of individual detections into a single coherent path. The reason astronomers want to find more of them, particularly the extreme ones, is that their orbits carry information. Kevin Napia, an astrophysicist at the Center for Astrophysics, has described objects like these as a probe of the outer reaches of the solar system, capable of telling researchers how the giant planets moved during the early history of the system and whether something large and still undetected, is hiding out there. The idea of a ninth major planet, sometimes called planet 9, has been debated for years based on suspicious clustering in the orbits of a small number of extreme TNOs. Reuben is the first instrument capable of either confirming that signal or dispelling it.

[00:24:59]And the 380 trans Neptunian objects in this submission are again a sample. The official legacy survey of space and time has not yet officially begun. Everything described in this script came out of preliminary engineering and optimization runs conducted while the observatory was still being calibrated. Once the full survey starts, current simulations project roughly 11,000 new asteroids being identified every 2 to three nights during the surveys early years. Over the full decade of LSST, the same simulations project more than 5 million new solar system objects in total.

[00:25:34]Roughly 70% of those discoveries are expected to arrive within the first 2 years. The telescope that is about to do this is named after Vera Rubin, an American astronomer who working with her colleague Kent Ford in the 1970s measured how stars moved at the outer edges of galaxies. What they found could not be explained by the visible matter alone. The galaxies were rotating as though something else invisible and far heavier than anything they could see was holding them together. That work became the observational foundation for the idea of dark matter and it reshaped the way astronomers understand the universe at its largest scales. Ruben spent much of her career observing at Carnegie Institution telescopes in Chile, not far in spirit and in latitude from the ridge where the observatory that carries her name now stands. There is a certain coherence in that geography. The dark matter Vera Rubin helped characterize through stellar velocities at galactic edges is now understood to be the dominant structural scaffolding of the universe at every scale above individual stars. It shapes the growth of galaxy clusters, cosmic filaments, and the vast empty voids between them. The telescope named for her is now mapping a different kind of invisible structure, the uncataloged debris of solar system formation at the scale of our own immediate neighborhood. The questions are different in kind. The method is the same. Look carefully enough at how things move and the invisible begins to reveal itself. Inside a region we have been mapping for over two centuries with telescopes refined across generations.

[00:27:12]There are still millions of objects we have never seen. Over the next 10 years, on a ridge in the Chilean Andes, a single observatory will find most of them. The first 11,000 were just the warm-up.