NASA Just Saw Haumea for the First Time — Scientists Didn't Expect This

[00:00:00]Four billion miles from where you are sitting right now, there is a world spinning so fast that if you stood on its surface, you would feel noticeably lighter at the equator than at the poles. And you would watch an entire day pass in under four hours. This world is not round. It is not even close to round. It looks like a rugby ball flung across the solar system, spinning end over end so violently that gravity itself has failed to pull it into a sphere. For decades, telescopes could only catch a faint trembling point of light where this object should be. Then piece by piece across more than 20 years of patient observation, astronomers assembled a picture of something so strange that many still describe it as the weirdest object in the entire solar system. Its name is Ha, and what scientists have pieced together about it reads less like a planetary science report and more like the aftermath of a cosmic car crash. To understand why Homea looks the way it does, you have to go back to the region of space where it lives. Beyond the orbit of Neptune, roughly four billion miles from the sun, lies a vast, dark ring of icy debris called the Kyper belt. This is not empty space. It is a graveyard in a nursery at the same time, filled with hundreds of thousands of frozen bodies left over from the formation of the solar system, ranging from tiny chunks of ice to full-size dwarf planets. Pluto lives here. So does Aras, make Sedna, Quawar, and Orcus. And so does Hamia, a body that orbits the sun once every 285 years, so far from the light and warmth of home that from its surface, the sun would appear as little more than an unusually bright star. Jameo was found in the mid 2000s, and the story of exactly who found it first is one of the messier chapters in modern astronomy. A team led by planetary scientist Mike Brown at Caltech had been photographing this region of sky for months using telescopes at Paloma Observatory in California. In their observation logs, they had unknowingly captured images of the object as early as May 2004, though they did not immediately recognize what they were looking at. Brown's team nicknamed the object Santa, partly because they spotted it clearly just after Christmas in December 2004. They held off on announcing the discovery, wanting more time to study it and its surroundings. And during that extra time, they discovered something remarkable. Santa had not one, but two small moons orbiting it. While Brown's team was quietly gathering more data, a separate group in Spain, led by astronomer Joseé Luis Ortiz Moreno at the Sierra Nevada Observatory, was digging through their own archive of sky images. They found the same object in photographs taken back in March 2003.

[00:02:29]When they checked whether the object was already known, they came across an online summary that Brown's team had posted describing their unannounced discovery. Ortiz's team then submitted their own report to the minor planet center, effectively announcing the object to the world before Brown's team had planned to. Brown later accused the Spanish team of accessing his private observation logs to confirm their own find, an accusation Ortiz's team has disputed, saying they only used publicly available data to refine an orbit calculation after independently finding the object. The dispute over who truly discovered Homea first has never been fully settled. And to this day, references to the object's discovery often credit both teams, with the object officially dated to the earlier Spanish observation from March 2003. The dispute grew heated enough that Brown eventually accused the Spanish team of fraud outright, while Ortiz's team countered that the Americans had tried to use political influence within the International Astronomical Union to strip away their claim. Adding to the confusion, on the very same day that Ortiz announced Hamea's discovery to the world, Brown's team submitted a separate paper describing the discovery of Heliera's first moon and then within days announced an entirely different object altogether. Aerys, a body outpassed Pluto that appeared to be even larger, sparking a firestorm of its own about what actually counts as a planet.

[00:03:42]It was briefly one of the strangest weeks in the history of solar system discovery with two rival teams, two contested announcements and headlines calling Hameha nothing less than a tenth planet before the International Astronomical Union stepped in later that same year to formally define what a dwarf planet actually is. A definition that would eventually apply to Homea, Aerys, Pluto, and several others. What both teams agreed on eventually was a name. In 2008, the International Astronomical Union formally named the object Homea after the Hawaiian goddess of childbirth and fertility. The name turned out to be strangely fitting. In Hawaiian mythology, Hameha's children were said to have sprung from different parts of her body. This object too appears to have given rise to offspring, a family of icy fragments scattered across the Kyper belt that share strikingly similar orbits and more importantly a nearly identical spectral signature, meaning they reflect light in almost exactly the same way that Homia does. Roughly a dozen of these smaller bodies have been identified so far, and they are believed to be pieces that were violently shed from Homea itself at some point in its history. This makes Hamea's family the only confirmed collisional family of objects known in the Kyper belt. a scattering of siblings born from the same ancient event. That event, most scientists agree, was a colossal impact.

[00:04:56]Somewhere in the chaotic early history of the solar system, something struck the young, still forming Homea with tremendous force. The collision did not shatter the object completely, but it did something almost as dramatic. It spun Ha up to a blistering rotation rate and blasted a portion of its outer layers into space. Some of which reformed into small moons and some of which scattered outward to become the icy siblings we detect today.

[00:05:20]Researchers at NASA's Gddard Space Flight Center have used computer modeling to reconstruct this history. By studying how mass is distributed inside HIA today and how that distribution shapes its current rotation, a team led by scientist Jessica Nove ran simulations spanning billions of years of evolution, testing different starting conditions to see which ones would produce the homo we observe now. Their model suggests the infant Hamia may have been around 3% larger than it is today with the missing material accounting for the creation of its Kyper belt siblings and that it likely started out spinning at a different rate and with a different overall shape before settling into the object we see now. It is in a very real sense a survivor of a violent adolescence still bearing the physical scars of that collision billions of years later. What's notable about this kind of research is how much it depends on working backward. Nobody was present billions of years ago to record the collision, and no spacecraft has ever flown close enough to photograph Hamia's surface for clues. Instead, scientists like Novell and her collaborators start with the object as it exists today, its measured mass, its rotation speed, its density, and its shape, and use that present-day snapshot as the fixed endpoint of the simulation. From there, they run the physics forward from many different plausible starting conditions, adjusting variables like the object's original size, its original spin rate, and how its internal mass was distributed, and checking which combinations of starting conditions evolved forward across billions of years actually land on the HIA we observe now.

[00:06:46]Most combinations fail to reproduce the real object at all. The value of the small number that do succeed is that they narrow down what the ancient impact must have looked like. Not through direct observation, but through a process of elimination that is in its own way as rigorous as any laboratory experiment. The most immediate invisible scars shape. Most large bodies in the solar system once they grow big enough are pulled by their own gravity into a round or nearly round shape. This is one of the defining characteristics scientists use to decide whether an object qualifies as a dwarf planet in the first place. enough mass and therefore enough gravity to force itself into hydrostatic equilibrium, meaning a smooth rounded form. Homea technically meets this bar, but just barely, and its shape looks nothing like a sphere.

[00:07:30]Instead, it is elongated, almost egg-shaped, sometimes described by scientists as resembling a deflated American football or rugby ball tumbling end over end. Its long axis is dramatically stretched compared to its shorter axis, a distortion caused directly by its rotation. And that rotation is extreme. Ha completes one full spin on its axis in only about 3 hours and 52 minutes. To put that in perspective, Earth takes 24 hours to complete a single rotation. Homea, a body with roughly a third of Pluto's mass, spins more than six times faster than our planet does, making it the fastest rotating large body known anywhere in the solar system. At that speed, centrifugal force is stretching the object outward along its equator so severely that it physically cannot maintain a spherical shape. Even though it has more than enough mass and gravity to otherwise pull itself into one, it is quite literally spinning itself into an oval. This is precisely why occupies such an unusual place in the official rule book of the solar system. When the International Astronomical Union created the category of dwarf planet in 2006, the defining requirement was that an object be massive enough for its own gravity to overcome the rigidity of its material and pull it into a round or nearly round shape. A state astronomers call hydrostatic equilibrium. For most bodies, meeting that threshold simply means looking like a sphere. Homea complicates the picture because it clearly has enough mass to satisfy the physics behind that requirement. and computer models of its interior confirm that a body with its composition and mass would naturally settle into a rounded form if it were rotating at a normal speed. It is only because Homea happens to be spinning so many times faster than a typical world of its size that its equilibrium shape gets stretched into something so far from spherical. In other words, Homea is not misshapen because it lacks the gravity to be round. It is misshapen because something billions of years ago spun it up far beyond what its gravity could keep in check. Sizing up an object like this from four billion miles away is a genuine scientific challenge, and the estimates for Huma's dimensions have shifted over time as new data has come in. Current measurements suggest Huma's long axis stretches for roughly 1,960 km, while its shorter axis are considerably smaller, giving the object a lopsided, stretched out silhouette rather than a uniform diameter. Its average radius is estimated at around 800 km. Despite its unusual shape, its overall volume is actually smaller than that of some other large trans neptunian objects, even though its long axis is longer than theirs, simply because so much of Jamea's bulk has been stretched thin rather than packed into a compact sphere. Astronomers have made this comparison directly against another distant world called 2007 O10, currently the largest known unnamed body in the solar system with a diameter of roughly 1,535 km. How's long axis stretches out well beyond that figure. And yet, because so much of that length comes from elongation rather than genuine bulk, 200710 actually contains more total volume than Helmia does. It's a useful reminder that in a solar system full of distant, dimly lit worlds. Simple measurements like how long is it can be deeply misleading without knowing the full three-dimensional shape behind the number. Four billion miles from where you are sitting right now, there is a world spinning so fast that if you stood on its surface, you would feel noticeably lighter at the equator than at the poles. And you would watch an entire day pass in under four hours.

[00:10:49]This world is not round. It is not even close to round. It looks like a rugby ball flung across the solar system, spinning end over end so violently that gravity itself has failed to pull it into a sphere. For decades, telescopes could only catch a faint trembling point of light where this object should be.

[00:11:05]Then, piece by piece, across more than 20 years of patient observation, astronomers assembled a picture of something so strange that many still describe it as the weirdest object in the entire solar system. Its name is Hamea, and what scientists have pieced together about it reads less like a planetary science report and more like the aftermath of a cosmic car crash. To understand why Homea looks the way it does, you have to go back to the region of space where it lives. Beyond the orbit of Neptune, roughly four billion miles from the sun, lies a vast, dark ring of icy debris called the Kyper belt. This is not empty space. It is a graveyard in a nursery at the same time, filled with hundreds of thousands of frozen bodies left over from the formation of the solar system, ranging from tiny chunks of ice to full-size dwarf planets. Pluto lives here. So does Aras, MCMake, Sedna, Quawir, and Orcus.

[00:11:54]And so does Hamia, a body that orbits the sun once every 285 years, so far from the light and warmth of home that from its surface, the sun would appear as little more than an unusually bright star. Jameo was found in the mid 2000s, and the story of exactly who found it first is one of the messier chapters in modern astronomy. A team led by planetary scientist Mike Brown at Caltech had been photographing this region of sky for months using telescopes at Palmer Observatory in California. In their observation logs, they had unknowingly captured images of the object as early as May 2004, though they did not immediately recognize what they were looking at. Brown's team nicknamed the object Santa, partly because they spotted it clearly just after Christmas in December 2004. They held off on announcing the discovery, wanting more time to study it and its surroundings. And during that extra time, they discovered something remarkable. Santa had not one but two small moons orbiting it. While Brown's team was quietly gathering more data, a separate group in Spain, led by astronomer Joseé Luis Ortiz Moreno at the Sierra Nevada Observatory, was digging through their own archive of sky images. They found the same object in photographs taken back in March 2003.

[00:13:06]When they checked whether the object was already known, they came across an online summary that Brown's team had posted describing their unannounced discovery. Ortiz's team then submitted their own report to the minor planet center, effectively announcing the object to the world before Brown's team had planned to. Brown later accused the Spanish team of accessing his private observation logs to confirm their own find, an accusation Ortiz's team has disputed, saying they only used publicly available data to refine an orbit calculation after independently finding the object. The dispute over who truly discovered Homea first has never been fully settled. And to this day, references to the object's discovery often credit both teams, with the object officially dated to the earlier Spanish observation from March 2003. The dispute grew heated enough that Brown eventually accused the Spanish team of fraud outright, while Ortiz's team countered that the Americans had tried to use political influence within the International Astronomical Union to strip away their claim. Adding to the confusion, on the very same day that Ortiz announced Hamea's discovery to the world, Brown's team submitted a separate paper describing the discovery of Hamea's first moon and then within days announced an entirely different object altogether. Aerys, a body outpassed Pluto that appeared to be even larger, sparking a firestorm of its own about what actually counts as a planet. It was briefly one of the strangest weeks in the history of solar system discovery with two rival teams, two contested announcements and headlines calling Jamea nothing less than a tenth planet before the International Astronomical Union stepped in later that same year to formally define what a dwarf planet actually is. A definition that would eventually apply to Homea, Aerys, Pluto, and several others. What both teams agreed on eventually was a name. In 2008, the International Astronomical Union formally named the object Homea after the Hawaiian goddess of childbirth and fertility. The name turned out to be strangely fitting. In Hawaiian mythology, Hameha's children were said to have sprung from different parts of her body. This object too appears to have given rise to offspring, a family of icy fragments scattered across the Kyper belt that share strikingly similar orbits and more importantly a nearly identical spectral signature, meaning they reflect light in almost exactly the same way that Homia does. Roughly a dozen of these smaller bodies have been identified so far, and they are believed to be pieces that were violently shed from Homea itself at some point in its history. This makes Hamea's family the only confirmed collisional family of objects known in the Kyper belt. A scattering of siblings born from the same ancient event. That event, most scientists agree, was a colossal impact.

[00:15:34]Somewhere in the chaotic early history of the solar system, something struck the young, still forming Homea with tremendous force. The collision did not shatter the object completely, but it did something almost as dramatic. It spun Ha up to a blistering rotation rate and blasted a portion of its outer layers into space. Some of which reformed into small moons and some of which scattered outward to become the icy siblings we detect today.

[00:15:58]Researchers at NASA's Gddard Space Flight Center have used computer modeling to reconstruct this history. By studying how mass is distributed inside Hamia today and how that distribution shapes its current rotation, a team led by scientist Jessica Novello ran simulations spanning billions of years of evolution, testing different starting conditions to see which ones would produce the homo we observe now. Their model suggests the infant Helmia may have been around 3% larger than it is today with the missing material accounting for the creation of its Kyper belt siblings and that it likely started out spinning at a different rate and with a different overall shape before settling into the object we see now. It is in a very real sense a survivor of a violent adolescence still bearing the physical scars of that collision billions of years later. What's notable about this kind of research is how much it depends on working backward. Nobody was present billions of years ago to record the collision, and no spacecraft has ever flown close enough to photograph Hamia's surface for clues.

[00:16:52]Instead, scientists like Noveists today, its measured mass, its rotation speed, its density, and its shape, and use that present-day snapshot as the fixed end point of the simulation. From there, they run the physics forward from many different plausible starting conditions, adjusting variables like the object's original size, its original spin rate, and how its internal mass was distributed, and checking which combinations of starting conditions evolved forward across billions of years actually land on the HIA we observe now.

[00:17:23]Most combinations fail to reproduce the real object at all. The value of the small number that do succeed is that they narrow down what the ancient impact must have looked like. Not through direct observation, but through a process of elimination that is in its own way as rigorous as any laboratory experiment. The most immediate invisible scars shape. Most large bodies in the solar system once they grow big enough are pulled by their own gravity into a round or nearly round shape. This is one of the defining characteristics scientists use to decide whether an object qualifies as a dwarf planet in the first place. enough mass and therefore enough gravity to force itself into hydrostatic equilibrium, meaning a smooth rounded form. Homea technically meets this bar, but just barely, and its shape looks nothing like a sphere.

[00:18:08]Instead, it is elongated, almost egg-shaped, sometimes described by scientists as resembling a deflated American football or rugby ball tumbling end over end. Its long axis is dramatically stretched compared to its shorter axis, a distortion caused directly by its rotation. And that rotation is extreme. Ha completes one full spin on its axis in only about 3 hours and 52 minutes. To put that in perspective, Earth takes 24 hours to complete a single rotation. Homea, a body with roughly a third of Pluto's mass, spins more than six times faster than our planet does, making it the fastest rotating large body known anywhere in the solar system. At that speed, centrifugal force is stretching the object outward along its equator so severely that it physically cannot maintain a spherical shape. Even though it has more than enough mass and gravity to otherwise pull itself into one, it is quite literally spinning itself into an oval. This is precisely why Omea occupies such an unusual place in the official rule book of the solar system.

[00:19:04]When the International Astronomical Union created the category of dwarf planet in 2006, the defining requirement was that an object be massive enough for its own gravity to overcome the rigidity of its material and pull it into a round or nearly round shape. A state astronomers call hydrostatic equilibrium. For most bodies, meeting that threshold simply means looking like a sphere. Homea complicates the picture because it clearly has enough mass to satisfy the physics behind that requirement. and computer models of its interior confirm that a body with its composition and mass would naturally settle into a rounded form if it were rotating at a normal speed. It is only because Homea happens to be spinning so many times faster than a typical world of its size that its equilibrium shape gets stretched into something so far from spherical. In other words, Homea is not misshapen because it lacks the gravity to be round. It is misshapen because something billions of years ago spun it up far beyond what its gravity could keep in check. Sizing up an object like this from four billion miles away is a genuine scientific challenge, and the estimates for Huma's dimensions have shifted over time as new data has come in. Current measurements suggest Huma's long axis stretches for roughly 1,960 km, while its shorter axes are considerably smaller, giving the object a lopsided, stretched out silhouette rather than a uniform diameter. Its average radius is estimated at around 800 km. Despite its unusual shape, its overall volume is actually smaller than that of some other large trans neptunian objects, even though its long axis is longer than theirs, simply because so much of Jamea's bulk has been stretched thin rather than packed into a compact sphere. Astronomers have made this comparison directly against another distant world called 2007 O10, currently the largest known unnamed body in the solar system with a diameter of roughly 1,535 km. Helme's long axis stretches out well beyond that figure. And yet, because so much of that length comes from elongation rather than genuine bulk, 2007 O10 actually contains more total volume than Helmia does. It's a useful reminder that in a solar system full of distant, dimly lit worlds, simple measurements like how long is it can be deeply misleading without knowing the full three-dimensional shape behind the