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NASA’s Hubble Discovers First of Star Cluster’s Missing Black Holes

The massive globular star cluster Omega Centauri has puzzled astronomers for decades. It should be filled with black holes left behind by exploding stars, yet evidence for them is scarce. Now, astronomers using archival data from NASA’s Hubble Space Telescope and supportive observations from NASA’s James Webb Space Telescope have finally located their first stellar-mass black hole in this cluster. Discovering the first of this missing black hole population will help refine current theories on black hole formation within environments such as Omega Centauri. The team’s findings published Monday in The Astrophysical Journal Letters.

Omega Centauri is composed of 10 million gravitationally bound stars. Though the astronomical community previously found evidence with Hubble that an intermediate-mass black hole lurks at its center, models suggest this star cluster should also contain about 10,000 smaller, stellar-mass black holes. This notable population of black holes evaded detection in previous observational studies, which used the radial velocity method or looked for radio and X-ray emission from material falling onto black holes.

This new discovery features a different approach, known as astrometry, to measure very small movements of stars over time. By sifting through more than 20 years of Hubble archival data and pulling in recent Webb data to further refine their astrometric measurements, the team located a star orbiting an invisible object so hefty that it has to be a black hole. Dubbed oMEGACat BH-2, it is the first stellar-mass black hole detected in Omega Centauri, and it has some surprising qualities. oMEGACat BH-2 has a lower-than-expected mass and, with its visible star companion, the black hole-star duo has the longest orbital period of any black hole binary system known to date.

“With Hubble and Webb data, we were able to see the motion of the visible main sequence star that is part of this binary, which is about 18,000 light-years away in the dense environment of Omega Centauri,” said Matthew Whitaker of the University of Utah, Salt Lake City, lead author of the paper. “The precision of these measurements is incredible, down to a fraction of a pixel on Hubble and Webb’s detectors. It would not have been possible to find this black hole without these two space telescopes.”

The team’s findings refine a past study by a different group of scientists that suggested this binary system included a neutron star. By expanding Hubble data from the earlier investigation with archival Hubble astrometric measurements from 2002 to 2023, and pulling in Webb near-infrared data to improve precision, the University of Utah-led team was able to better constrain the mass of the visible star’s dark companion, ruling out the neutron star possibility.

“While we already knew that the star was 0.78 solar masses, we can now calculate the black hole’s mass, which is 4.46 solar masses and therefore too heavy to be a neutron star. However, its mass is much lower than would be expected in a metal-poor environment like Omega Centauri. This is surprising and exciting,” said Anil Seth of the University of Utah, a coauthor of the study. “We now know that a metal-poor star is able to form a black hole like this, and we need to figure out how that happens. This detection is providing some data to those who do that kind of modeling.”

Long time coming

Based on the precise data from Hubble and Webb, the team could chart the star’s path over 20-plus years, during its closest approach to its black hole companion when it moved the fastest across the sky. From the extensive data, the team determined that the visible star orbits oMEGACat BH-2 once every 94 years, making it the longest-period black hole binary ever known.

Its long orbital period also gives a clue to the origin of this binary system. It was probably dynamically formed, meaning the star and its black hole companion did not start out together but rather found each other in this cluster. The researchers calculated that a system like oMEGACat BH-2 will survive for less than a billion years before it is torn apart by encounters with nearby stars, a much shorter span than the age of the cluster (approximately 12 billion years old).

“It’s important to understand black hole populations in globular clusters because there’s uncertainty about their physics and formation,” said Seth. “More specifically, understanding the process of forming black holes and then dynamically forming binaries is vital, because it affects our ability to interpret and understand gravitational wave events. Environments like Omega Centauri are the primary places where we think binaries are merging and creating these waves.”

The team’s discovery of stellar-mass black hole oMEGACat BH-2 with the Hubble-Webb dataset is just the start of finding these evasive black hole populations in globular star clusters.

“With Hubble and Webb, we can continue to look at Omega Centauri and expand our search for similar systems within other clusters,” said Whitaker. “We’re also very excited for the launch of NASA’s Nancy Grace Roman Space Telescope because it will image the crowded galactic bulge, including the galactic center, very regularly with Hubble-like resolution and with a much wider field of view. We’re hoping we’ll be able to find black hole binary systems like this one because of the regular cadence of Roman’s observations.”

The Hubble Space Telescope has been operating for over three decades and continues to make ground-breaking discoveries that shape our fundamental understanding of the universe. Hubble is a project of international cooperation between NASA and ESA (European Space Agency). NASA’s Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope and mission operations. Lockheed Martin Space, based in Denver, also supports mission operations at Goddard. The Space Telescope Science Institute in Baltimore, which is operated by the Association of Universities for Research in Astronomy, conducts Hubble science operations for NASA.

Related Images & Videos

Omega Centauri Context Image

Astronomers found Omega Centauri’s first stellar-mass black hole, which has a visible star companion that is shown in greater detail. They used 20-plus years of data from NASA’s Hubble Space Telescope and recent data from NASA’s James Webb Space Telescope to make the discovery.

Star Orbiting Black Hole Animation

The precise data collected by NASA’s Hubble and James Webb space telescopes enabled a team of astronomers to chart the visible star’s orbital path over a 20 year-plus period.

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Caldwell 80

Better known as Omega Centauri, Caldwell 80 is home to around 10 million stars.

From declines in annual sea ice extent to the greening of the tundra, environmental change has been unfolding incrementally in the Arctic over decades. Some shifts, however, have come on more abruptly.

Satellite, aerial, and ground-based surveys spanning more than 600 miles (1,000 kilometers) across Alaska’s Brooks Range have observed stream water changing from clear to orange in more than 200 watersheds. What’s more, scientists are finding that the switch has largely taken place within the past 10 to 12 years, coinciding with a pronounced increase in air and ground temperatures.

Thawing permafrost soils, accelerated by warming air and ground temperatures, are the most likely cause of the “rusty” rivers, scientists say. They surmise that water is now encountering thawed ground and bedrock where it previously had not. Chemical weathering of minerals leaches iron, sulfuric acid, and trace metals into streams, akin to the process behind acid mine drainage, which similarly pollutes and discolors water near abandoned mines. Microbes may also contribute to the color change by producing a soluble form of iron as they digest plant and animal matter in thawing soils, which then becomes oxygenated, or “rusts,” in flowing streams.

Researchers have only recently begun to comprehend the prevalence of rusting rivers in Arctic regions. In 2024, a team of National Park Service, U.S. Geological Survey, and university scientists documented 75 northern Alaskan streams that recently changed from clear to orange. With subsequent exploration, mostly using high-resolution satellite imagery, they added 200 more observations. The locations of these discolored streams, published in NOAA’s 2025 Arctic Report Card, are shown in the map above.

“I’m still surprised by the broad spatial scope of our observations,” said Brett Poulin, environmental toxicologist at the University of California, Davis. He and his collaborators have been monitoring the region’s streams since 2013—when many were still clear. “Now we’re seeing hundreds of streams that have changed color seemingly overnight, including in designated National Wild & Scenic River corridors,” he said.

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Image Details

The Agashashok River in Noatak National Preserve is one of many streams in Alaska whose water has turned from clear to rusty orange. The change appears in these images, acquired on July 12, 2017 (left), and July 20, 2020 (right), by the OLI (Operational Land Imager) on Landsat 8. NASA Earth Observatory images by Michala Garrison.

Observations from NASA/USGS Landsat satellites allowed the team to determine the timing of several of these changes. For the 2024 study led by ecologist Jon O’Donnell of the National Park Service, the team calculated a redness index based on red and blue spectral information sensitive to the color of iron hydroxides (i.e., rust) in water. After analyzing a subset of streams, they found that some turned rusty around 2018 and stayed that way, while others had periods of rusting and then returned to being clear.

One stream that underwent a sudden change is the Agashashok River in Noatak National Preserve (above). In 2019, a jump in redness values appeared in Landsat data along this waterway. Ground and aerial surveys the same year found an orange section of the river several kilometers long, and vegetation around nearby groundwater seeps and springs appeared blackened. “The Landsat archive has proved uniquely useful for investigating the historical onset of rusting rivers where creeks and rivers are sufficiently large,” Poulin said.

Having gained a better picture of the extent and timing of the phenomenon, the researchers want to focus on the conditions driving the orange color’s onset and the yearly and seasonal changes. A deep snowpack may play a role some years, for example, by insulating the soil from cold winter temperatures and enabling permafrost thaw earlier in the summer. In addition, periods of higher streamflow throughout the year can dilute the discoloration. The team is planning a geophysical survey along a hillslope where acidic groundwater is discharging to the surface to investigate the subsurface geology, hydrology, and permafrost.

Further, they seek to quantify the effects on water quality and aquatic ecosystems. Communities rely on these river systems for drinking water and subsistence fisheries, and a decrease in stream biodiversity has already been documented in some locations coincident with water turning orange. The researchers now are looking deeper into the patterns of toxicity over time and space, such as where rusting rivers overlap with known spawning areas for migratory fish.

“The rusting river phenomenon is a good example of an unforeseen consequence of permafrost thaw in the Arctic,” Poulin said. “Further, it’s consistent with the emergence of acid rock drainage following cryosphere loss across Earth.”

NASA Earth Observatory images by Michala Garrison, using stream location data from O’Donnell, J.A., et al., and Landsat data from the U.S. Geological Survey. Story by Lindsey Doermann.

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July 12, 2017

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July 20, 2020

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References & Resources

• NASA Earth Observatory (2024, January 16) Rusting Rivers. Accessed July 9, 2026.
• O’Donnell, J. A., et al. (2025) Rusting Rivers: Assessing the Causes and Consequences in Alaska and Across the Arctic. Arctic Report Card 2025.
• O’Donnell, J. A., et al. (2024) Metal mobilization from thawing permafrost to aquatic ecosystems is driving rusting of Arctic streams. Communications Earth & Environment, 5, 268.
• U.S. Geological Survey (2026, February 27) The Rusting of Arctic Rivers: Freshwater Ecosystems Respond to Rapidly Uptaking Metals. Accessed July 9, 2026.

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The Zooniverse, a NASA grantee that runs the world’s largest platform for online people-powered research, has reached an extraordinary milestone: 1 billion classifications contributed by volunteers around the world. This milestone is a celebration of everyone who has marked a dip in a light curve, confirmed the presence of a moving object in a short video, or identified species in a camera trap image. Each of these small contributions collectively advances our understanding of the universe.

A total of 31 NASA-sponsored citizen science projects have been hosted on Zooniverse, accounting for 120 million classifications by 324 thousand volunteers since 2020. Through projects like Planet Hunters TESS, Daily Minor Planet, Backyard Worlds: Planet 9, Space Umbrella, and Snapshot Wisconsin, volunteers help discover exoplanets, identify near-Earth objects and asteroids, search for brown dwarfs and planetary systems, analyze effects of the solar wind, and inform wildlife management decisions. These projects have led to 96 scientific publications, and 56 of these articles feature NASA citizen scientists as co-authors to recognize the significance of their research contributions. These efforts demonstrate how public participation can accelerate discovery by combining human curiosity and pattern recognition with data from NASA missions and observatories. Collaboration between volunteers, scientists, and computing technology will be even more important in the future as we tackle enormous and complex datasets, like those from NASA’s upcoming Nancy Grace Roman Space Telescope. 

“One billion classifications represent far more than a number; it’s one billion moments of curiosity transformed into meaningful contributions to research,” said Laura Trouille, principal investigator of Zooniverse and vice president of Science Engagement at the Adler Planetarium. “Every classification on Zooniverse brings us one step closer to new discoveries and a deeper understanding of our universe, our world, and ourselves.” 

Zooniverse is the world’s largest platform for people-powered research. Co-founded by the Adler Planetarium and the University of Oxford, with the University of Minnesota serving as a key institutional partner, Zooniverse enables anyone, anywhere to contribute directly to real scientific research. Through its six-year collaboration with NASA, Zooniverse provides science-enabling infrastructure to NASA researchers through tools and a community of more than 3 million registered volunteers.

NASA flight photographers capture history from a perspective few ever experience, getting a rare bird’s-eye view of the agency’s missions in action. Their photos document key NASA research and give the public a front-row seat to the work happening behind the scenes.

Jim Ross, a photographer at NASA’s Armstrong Flight Research Center in Edwards, California, flew over Washington during the Fourth of July celebration to document a NASA flyover commemorating America’s 250th birthday. He’s captured some of the agency’s most exhilarating milestones, like early SR-71 flights, the delivery flight of Space Shuttle Endeavour to Los Angeles, and first flights of NASA’s X-59 quiet supersonic research aircraft.

“I grew up in Bozeman, Montana, when it was still considered a small town, so if someone told that little kid that he would be flying in a F-18 over the National Mall, he would have never believed it,” Ross said. “I love documenting history, and having the opportunity to capture flights and launches has kept me doing it for almost 37 years.”

Ross began his aviation photography career in 1989 when he joined the staff at NASA Armstrong (then Dryden). He became the photo lead in 1997, a title he retains.

Check out his images from the flyover here: https://www.nasa.gov/gallery/freedom-250/

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