We were simply not looking in the right way.
In the ancient light of a universe barely 750 million years old, astronomers have found a galaxy doing everything at once — forging stars at a furious pace, cloaking itself in cosmic dust, and feeding a supermassive black hole that by all prior reckoning should not yet exist. The discovery of COS-87259, made by researchers from the University of Texas and University of Arizona using a radio observatory in the Chilean desert, does not merely add a curiosity to the catalogue — it suggests an entire hidden population of early black holes that our instruments, trained on brighter and cleaner objects, were never designed to see. What we took for the full picture of cosmic dawn may have been only its most visible edge.
- A galaxy 750 million years after the Big Bang is forming stars a thousand times faster than the Milky Way while its central black hole devours matter and fires jets near the speed of light — a level of simultaneous extremity that strains existing models.
- The black hole is so thoroughly buried in dust that its light escapes only in the mid-infrared, rendering it invisible to the optical and near-infrared surveys that defined our understanding of the early universe for decades.
- Found in a patch of sky smaller than ten full moons, COS-87259 implies that thousands of similar dust-shrouded black holes may be scattered across the early cosmos — dwarfing the mere dozens of known early quasars and exposing a vast blind spot in the field.
- Theorists had long predicted that intense early star formation would obscure growing black holes, and this discovery validates that mechanism — suggesting co-evolution between stars and black holes was not gradual but violent and mutually accelerating.
- The field is now recalibrating: if dust-obscured black holes were the dominant mode of early cosmic growth, the entire story of how today's massive galaxies came to be must be rewritten.
Astronomers have found a galaxy that seems to defy what the early universe should have been capable of. Known as COS-87259, it sits just 750 million years after the Big Bang and is producing stars a thousand times faster than the Milky Way, harboring over a billion solar masses of cosmic dust, and sustaining a supermassive black hole that is actively feeding and launching jets of matter at nearly the speed of light. The discovery was made using the Atacama Large Millimeter Array in Chile by researchers at the University of Texas and University of Arizona.
What unsettles astronomers most is not the object itself but what it implies about everything we have missed. COS-87259 was found in a patch of sky smaller than ten times the area of the full moon. If one such extreme galaxy exists in so small a region, thousands of similar objects may populate the early universe — a hidden population that has gone undetected because the dust wrapping these black holes buries their light in the mid-infrared, invisible to the optical surveys that defined our picture of cosmic dawn. Until now, the only supermassive black holes known at these distances were quasars — bright, dust-free, and extraordinarily rare. COS-87259 suggests they were never the whole story.
Lead researcher Ryan Endsley noted that the findings confirm long-standing theoretical predictions: early supermassive black holes were likely obscured precisely because of the intense star formation surrounding them, with both processes feeding on the same reservoir of gas and accelerating each other. The same dynamic is visible closer to home in colliding galaxy systems like Arp 299, but what was thought to be a local exception may have been the universe's dominant early mode.
If thousands of these dust-shrouded giants once crowded the young cosmos, the relationship between galaxies and their central black holes is far more chaotic and intertwined than models have assumed. The universe's earliest chapters, it turns out, were written in a light we had not yet learned to read.
Astronomers have spotted something that shouldn't exist—or at least, not in the numbers we're now beginning to suspect. Deep in the early universe, roughly 750 million years after the Big Bang, sits a galaxy called COS-87259 that is doing almost everything to an extreme. It is manufacturing stars at a rate a thousand times faster than our own Milky Way. It harbors more than a billion solar masses worth of cosmic dust swirling through its structure. And at its heart sits a supermassive black hole that is actively feeding, pulling material inward and launching jets of matter outward at nearly the speed of light.
The discovery, made using the Atacama Large Millimeter Array—a radio observatory perched in the Chilean desert—comes from researchers at the University of Texas and the University of Arizona. What makes COS-87259 remarkable is not just that it exists, but what it tells us about a blind spot in our understanding of the cosmos. For decades, astronomers have known that supermassive black holes sit at the center of nearly every galaxy we observe today, each one containing millions to billions of times the mass of our sun. The puzzle has always been how these monsters grew so quickly. Several have been found when the universe was still in its infancy, which should have been impossible given the time constraints.
The black hole at the heart of COS-87259 belongs to a category researchers are now calling a new type of primordial black hole—one so thoroughly wrapped in cosmic dust that nearly all of its light emerges in the mid-infrared portion of the spectrum, invisible to many of our traditional instruments. This dust obscuration is crucial. It suggests a mechanism: perhaps these early supermassive black holes grew rapidly not despite the intense star formation happening around them, but because of it. The same violent processes that were birthing stars by the millions were also feeding the black hole and shrouding it in material.
What makes the discovery truly unsettling to astronomers is where it was found. COS-87259 was identified in a patch of sky smaller than ten times the area of the full moon. If one such object exists in such a small region, the math becomes staggering. There could be thousands of similar sources scattered throughout the early universe. Until now, the only supermassive black holes we knew about at these cosmic distances were quasars—active black holes that shine brightly because they are relatively free of dust. These quasars are extraordinarily rare, with only a few dozen known across the entire sky. The existence of COS-87259 suggests we have been missing an entire population.
Ryan Endsley, the lead researcher on the study published in the Monthly Notices of the Royal Astronomical Society, noted that this discovery validates predictions theorists have been making for years. "These results suggest that very early supermassive black holes were often heavily obscured by dust, perhaps as a consequence of the intense star formation activity in their host galaxies," he said. The parallel exists in our own cosmic neighborhood: galaxies like Arp 299, where two systems are colliding and triggering a violent burst of star formation while simultaneously obscuring the black hole at the center. What we thought was a local phenomenon may have been the dominant mode in the early universe.
The implications ripple outward. If thousands of dust-shrouded supermassive black holes populated the young universe, it reshapes how we understand the relationship between galaxies and their central black holes. It suggests that the most massive galaxies we see today may have evolved through a phase of intense, chaotic co-growth—black holes and stars feeding on the same reservoir of gas, each accelerating the other's development. The universe, it seems, was far more crowded with these extreme objects than we had any reason to believe. And we were simply not looking in the right way.
Notable Quotes
These results suggest that very early supermassive black holes were often heavily obscured by dust, perhaps as a consequence of the intense star formation activity in their host galaxies.— Ryan Endsley, lead researcher, University of Texas
Its discovery takes a step towards building a much better understanding of how billion solar mass black holes were able to form so early on in the lifetime of the Universe.— Ryan Endsley
The Hearth Conversation Another angle on the story
Why does it matter that this black hole is obscured by dust rather than shining clearly like a quasar?
Because dust obscuration tells us something about the environment. If the black hole is buried in dust, it means there's intense star formation happening around it—the same process that creates the dust is also feeding the black hole. We were only seeing the bright, unobscured ones before, which gave us a skewed picture.
So we've been missing an entire category of objects?
Exactly. We thought early supermassive black holes were rare. But if one exists in a patch of sky smaller than ten times the full moon, there could be thousands out there. We just weren't equipped to see them until now.
How does a black hole grow so massive so quickly in the early universe?
That's the central mystery. These objects shouldn't have had time to accumulate billions of solar masses in just a few hundred million years. But if they're embedded in galaxies undergoing violent star formation, with abundant gas to consume, the growth becomes plausible.
What does this tell us about how galaxies themselves formed?
It suggests galaxies and their central black holes grew together, feeding off the same material. The black hole wasn't a late arrival—it was integral to the galaxy's development from the start, shaping how the galaxy evolved.
Is this discovery going to change how we search for early black holes?
It has to. We need to look in the infrared and millimeter wavelengths where dust-obscured objects emit their light. The traditional methods were blind to an entire population.