Astronomical black holes are compact astrophysical systems characterized by regions of spacetime where gravity is so strong that no matter or radiation can escape beyond the event horizon. They are described by solutions to Einstein’s field equations, typically approximated by the Kerr or Schwarzschild metrics, and are defined by mass, spin, and (negligible) charge. Formed primarily via stellar core collapse or hierarchical mergers, they interact with their environments through accretion disks, relativistic jets, and gravitational-wave emission. Astronomical black holes span stellar-mass to supermassive regimes, influencing galactic dynamics, high-energy radiation processes, and cosmological structure formation.
Astronomers have confirmed the first known triple system in which all three galaxies host actively feeding, radio-bright supermassive black holes.
Astronomy
Dec 24, 2025
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Black holes are notorious for gobbling up everything that comes their way, but astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) have discovered that even supermassive black holes can be picky eaters, ...
Astronomy
Dec 22, 2025
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When two black holes merge or two neutron stars collide, gravitational waves can be generated. They spread at the speed of light and cause tiny distortions in space-time. Albert Einstein predicted their existence, and the ...
General Physics
Dec 16, 2025
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Omega Centauri dominates the southern sky as the Milky Way's largest and brightest globular cluster, a dense sphere containing roughly 10 million stars. Earlier this year, astronomers found evidence that an intermediate mass ...
Astronomy
Dec 15, 2025
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What could force a supermassive black hole (SMBH) out of its host galaxy? They can have hundreds of millions, even billions of solar masses. What's powerful enough to dislodge one of these behemoths?
Astronomy
Dec 15, 2025
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Compelling evidence that the structure of matter surrounding supermassive black holes has changed over cosmic time has been uncovered by an international team of astronomers.
Astronomy
Dec 11, 2025
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The cosmos has served up a gift for a group of scientists who have been searching for one of the most elusive phenomena in the night sky. Their study, presented in Science Advances, reports on the very first observations ...
Astronomy
Dec 10, 2025
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A research team from the Yunnan Observatories of the Chinese Academy of Sciences (CAS), in collaboration with other researchers, has developed a new method to estimate how stellar-mass compact objects (COs)—including black ...
Astronomy
Dec 10, 2025
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Galaxy clusters are the most massive objects in the universe held together by gravity, containing up to several thousand individual galaxies and huge reservoirs of superheated, X-ray-emitting gas. The mass of this hot gas ...
Astronomy
Dec 10, 2025
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Intermediate mass black holes (IMBH), if they exist, have between about 100 and 1,000 solar masses, placing them in between stellar black holes and supermassive black holes. But while there's plenty of evidence for both stellar ...
Astronomy
Dec 9, 2025
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