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Black Holes
We can now use the gravitational waves of black holes to test general relativity and look for evidence of alternative theories of gravity.
Did primordial black holes born during the Big Bang swallow the universe's antimatter, allowing matter to dominate the cosmos?
Author(s): Lorenzo Ennoggi, Manuela Campanelli, Julian Krolik, Scott C. Noble, Yosef Zlochower, and Maria Chiara de SimoneState of the art numerical simulations predict telltale photon signatures from mergers of supermassive black holes. [Phys. Rev. Lett. 136, 111401] Published Tue Mar 17, 2026
The research could shed light on how black holes vomit out matter and how this influences their home galaxies.
An international team from China and Italy has reported a possible cosmic encore to the landmark 2017 multi-messenger discovery. In November 2024, the LIGO-Virgo-KAGRA observatories detected gravitational waves from a binary black hole merger, designated S241125n. Remarkably, just seconds later, satellites recorded a short gamma-ray burst (GRB) from the same region of the sky.
Despite years of debate and follow-up studies, an odd streak of cosmic light still defies a final explanation. Is it a giant black hole screaming through intergalactic space?
Scientists analyzing a gravitational-wave signal have discovered that a neutron star and black hole spiraled together on an oval-shaped orbit just before merging. This unusual motion, detected in the event GW200105, contradicts the long-held expectation that such pairs settle into nearly perfect circles before collision. The eccentric orbit suggests the system likely formed in a chaotic stellar environment with strong gravitational interactions.
Merging black holes and neutron stars have unusual oval orbits prior to colliding and merging, which challenge the laws of physics.
Scientists have uncovered the first robust evidence of a black hole and neutron star crashing together but orbiting in an oval path rather than a perfect circle just before they merged. This discovery challenges long-standing assumptions about how these cosmic pairs form and evolve.
Supermassive black hole binaries can be difficult to detect in many galaxies, but a new approach could find them by looking for the regular flashes of starlight caused by the gravitational lensing of these black holes.
The catastrophic collision of a black hole and a neutron star sent ripples across the universe. New analysis of those ripples could upend a major theory about how these extreme pairs form.
Scientists have uncovered the first robust evidence of a black hole and neutron star crashing together but orbiting in an oval path rather than a perfect circle just before they merged. This discovery challenges long-standing assumptions about how these cosmic pairs form and evolve.
A new paper makes the strange case for prime numbers at the heart of physics.
March 7, 2026: Our weekly roundup of the latest science in the news, as well as a few fascinating articles to keep you entertained over the weekend.
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The catalog of gravitational waves "heard" by LIGO, KAGRA and Virgo has doubled with detections of spacetime ripples.
Ripples in the fabric of space-time called gravitational waves may be the key to solving the Hubble tension — one of the biggest nagging problems in physics.
The strange case for prime numbers at the heart of physics
Intense radiation emitted by active supermassive black holes – thought to reside at the center of most, if
Black holes that turn matter into energy could explain dark energy and answer two other cosmic questions. Now, the challenge is to find them
In 1974, physicist Stephen Hawking described the potential for tiny, primordial black holes that existed at the dawn of time to explode — and reshaped what we knew about these cosmic behemoths.
"...we found that a very active, supermassive black hole in one galaxy can affect other galaxies across millions of light-years..."
Astronomers have used the LOFAR telescope array to create the largest radio survey of the cosmos, revealing 13.7 million cosmic scenes, including supermassive black holes, merging galaxies, and supernova explosions.
Flashes of gravitationally lensed starlight could act as cosmic lighthouses revealing the presence of binary supermassive black holes in close orbit.
Learn how supermassive black holes may be suppressing star formation in nearby galaxies.
An ancient, fast-feeding quasar is breaking the rules of how black holes consume matter and generate galaxy-shaping jets.
A new study looked at how a massive star in the Andromeda Galaxy disappeared due to the formation of a black hole
The NASA/JAXA X-ray spacecraft has allowed astronomers to dive into the metaphorical "eye of the storm" swirling around supermassive black holes.
Scientists have discovered that active supermassive black holes don't just kill their home galaxies, but can also eradicate star formation for their neighbors.
Theory says that, under the right conditions, massive stars can collapse directly into black holes without exploding as supernovae. But observational evidence of the phenomenon has been hard to get. Now astronomers have found some sequestered in archival data.
The early Universe was a busy place. As the infant cosmos exanded, that epoch saw the massive first stars forming, along with protogalaxies. It turns out those extremely massive early stars were stirring up chemical changes in the first globular clusters, as well. Not only that, many of those monster stars ultimately collapsed as black holes.
The Hubble and Chandra space telescopes are hunting for rogue black holes wandering through dwarf galaxies, which could provide a fossil record of how supermassive black hole growth in the early universe.
The KM3NeT collaboration is a large research group involved in the operation of a neutrino telescope network in the deep Mediterranean Sea, with the aim of detecting high-energy neutrino events. These are rare and fleeting high-energy interactions between neutrinos, particles with an extremely low mass that are sometimes referred to as "ghost particles."
An exotic type of dark matter could explain some of the characteristics of our galaxy’s central supermassive black hole, but many cosmologists are leery of the idea
We know that supermassive black holes can inhibit star formation in their galaxies. But new research and JWST observations show that the most luminous quasars can actually suppress star formation in neighbouring galaxies. SMBH may have played a more pronounced role in shaping the early Universe than previously thought.
If a pair of black holes coalesce into one, much of that vast energy can be released in a few seconds.
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Intense radiation emitted by active supermassive black holes—thought to reside at the center of most, if not all, galaxies—can slow star growth not just in their host galaxy, but also in galaxies millions of light-years away, according to a study led by Yongda Zhu, a postdoctoral researcher at the University of Arizona Department of Astronomy and Steward Observatory.
An unusual tidal disruption event spotted by astronomers may be the result of an elusive intermediate mass black hole ripping apart a star.
Scientists scanning the heart of the Milky Way have spotted a tantalizing signal: a possible ultra-fast pulsar spinning every 8.19 milliseconds near Sagittarius A*, the supermassive black hole at our galaxy’s core. Pulsars act like incredibly precise cosmic clocks, and finding one in this extreme environment could open a rare window into how space-time behaves under intense gravity.
Astronomers at the University of Warwick have discovered that black holes don’t just consume matter—they manage it, choosing
In 2014, a NASA telescope observed that the infrared light emitted by a massive star in the Andromeda galaxy gradually grew brighter. The star glowed more intensely with infrared light for around three years before fading dramatically and disappearing, leaving behind a shell of dust. Although a telescope captured the phenomenon at the time, it took years for scientists to notice it.
Recent observations suggest that 'runaway' black holes are tumbling through the cosmos. Building on decades of theory, the discovery adds a remarkable new chapter to the story of the universe.
A massive star 2.5 million light-years away simply vanished — and astronomers now know why. Instead of exploding in a supernova, it quietly collapsed into a black hole, shedding its outer layers in a slow-motion cosmic fade-out. The leftover debris continues to glow in infrared light, offering a long-lasting signal of the black hole’s birth. The finding reshapes our understanding of how some of the universe’s biggest stars meet their end.
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Scientists have named two systems of colliding supermassive black holes after Lord of the Rings locations, Gondor and Rohan.
Hypothetical dark matter stars known as "boson stars" could leave telltale ripples across the cosmos, offering researchers a new way to probe the invisible forces shaping the universe. In 2019, a strange event was observed in the depths of space. Called GW190521, the event sent out gravitational waves—invisible ripples in the universe—that were picked up on Earth. These waves appeared to mark the moment when two massive black holes, dozens of times the mass of our sun, collided and merged. Or at least, that was the initial theory.
A research paper argues that a star in the Andromeda galaxy collapsed into a black hole after failing to go supernova Read Full Article at RT.com
The collision of supermassive black holes shakes the entire cosmos,
The universe is a big place, and tracking down some of the more interesting parts of it is tricky. Some of the most interesting parts of it, at least from a physics perspective, are merging black holes, so scientists spend a lot of time trying to track those down. One of the most recent attempts to do so was published in The Astrophysical Journal Letters by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) collaboration. While they didn’t find any clear-cut evidence of continuous gravitational waves from merging black hole systems, they did manage to point out plenty of false alarms, and even disprove some myths about ones we thought actually existed.
Observation sheds new light on how some massive stars fade away The post Black hole is born with an infrared whimper appeared first on Physics World.
Supermassive black hole binaries form naturally when galaxies merge, but scientists have only confidently observed a very few of these systems that are widely separated. Black hole binaries that closely orbit each other have not yet been measured. In a paper published today in Physical Review Letters, the researchers suggest hunting down the hidden systems by searching for repeating flashes of light from individual stars lying behind the black holes as they are temporarily magnified by gravitational lensing as the binary orbits.
A “disappearing” star in the Andromeda galaxy is the closest and best candidate for a newborn black hole that astronomers have ever seen
Several years ago, an automated sky survey spotted a distant supermassive black hole that tore apart a star. The star that got too close, and the resulting tidal disruption event released a lot of energy. But the SMBH is exhibiting a strong case of cosmic indigestion, and has been burping out the remains of the star for four years. And it keeps getting brighter and brighter.
The earliest black holes in the universe may not have disappeared from Hawking radiation after all, new research hints. Instead, they fed on the energy of the ancient cosmos to grow supermassive.
Author(s): Hanxi Wang, Miguel Zumalacárregui, and Bence KocsisThe quasiperiodic lensing of starlight by a supermassive black hole binary system can leave imprints on the light curve of the host galaxy, which can help discover and characterize such binaries. [Phys. Rev. Lett. 136, 061403] Published Thu Feb 12, 2026
Failed supernova candidate points to a stealthy pathway of stellar collapse
Astronomers tracked a star in Andromeda as it dimmed and vanished without the usual fiery explosion, offering rare clues to how black holes form.
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Astronomers have watched a dying star fail to explode as a supernova, instead collapsing into a black hole. The remarkable sighting is the most complete observational record ever made of a star's transformation into a black hole, allowing astronomers to construct a comprehensive physical picture of the process.
Researchers propose detecting tight supermassive black hole binaries via repeating light flashes from stars magnified by gravitational lensing as the pair orbits, offering a new way to spot these hidden systems with upcoming surveys.
New research suggests that the heart of the Milky Way may be dominated by a dense clump of dark matter rather than the supermassive black hole Sagittarius A*.
New research reveals how quiet galactic engines can help shape entire galaxies.
Astronomers used the XRISM x-ray satellite to observe two supermassive black holes in two separate galaxy clusters. Researchers know that SMBH have powerful effects on star formation and galaxy evolution. The observations reveal new details in how it all works.
On July 2, 2025, the China-led Einstein Probe (EP) space telescope detected an exceptionally bright X-ray source whose brightness varied rapidly during a routine sky survey. Its unusual signal immediately set it apart from ordinary cosmic sources, triggering rapid follow-up observations by telescopes worldwide.
There's been widespread agreement that a supermassive black hole resides in the Milky Way's Center. But that may not be true. Researchers say that a dense clump of fermionic dark matter can also explain the motions of stars and gas clouds in the region. Crucially, it can also explain the famous Event Horizon Telescope image of the SMBH.
A supercharged neutrino that smashed into our planet in 2023 may have been spit out by an exploding primordial black hole with a "dark charge." If true, this theory could lead to a definitive catalog of all subatomic particles and unveil the elusive identity of dark matter.
The James Webb Space Telescope (JWST) was designed to look back in time and study galaxies that existed shortly after the Big Bang. In so doing, scientists hoped to gain a better understanding of how the universe has evolved from the earliest cosmological epoch to the present. When Webb first trained its advanced optics and instruments on the early universe, it discovered a new class of astrophysical objects: bright red sources that were dubbed "Little Red Dots" (LRDs). Initially, astronomers hypothesized that they could be massive star-forming regions, but this was inconsistent with established cosmological models.
Trapped somewhere between the big ideas of "2001" and the fun of a galaxy far, far away, this 1979 movie is a true space oddity.
Astronomers propose that an ultra-dense clump of exotic dark matter could be masquerading as the powerful object thought to anchor our galaxy, explaining both the blistering speeds of stars near the center and the slower, graceful rotation of material far beyond. This dark matter structure would have a compact core that pulls on nearby stars like a black hole, surrounded by a broad halo shaping the galaxy’s outer motion.
Recently published data from the Event Horizon Telescope (EHT) of the galaxy Messier 87 facilitate new insights into the direct environment of the central supermassive black hole. Measured differences in the radio light on different spatial scales can be explained by the presence of an as of yet undetected jet at frequencies of 230 Gigahertz at spatial scales comparable to the size of the black hole. The most likely location of the jet base is determined through detailed modeling.
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The discovery by JWST of a substantial population of compact "Little Red Dots" (LRDs) presented astronomers with a major mystery. By reproducing their spectra with simulations, a team argued that they were Direct Collapse Black Holes (DCBHs).
It's nicknamed Jetty McJetface.
An international collaboration of astrophysicists that includes researchers from Yale has created and tested a detection system that uses gravitational waves to map out the locations of merging black holes—known as supermassive black hole binaries—around the universe. Such a map would provide a vital new way to explore and understand astronomy and physics, just as X-rays and radio waves did in earlier eras, the researchers say. The new protocol demonstrated by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) offers a detection protocol to populate the map.
In 2023, a subatomic particle called a neutrino crashed into Earth with such a high amount of energy that it should have been impossible. In fact, there are no known sources anywhere in the universe capable of producing such energy—100,000 times more than the highest-energy particle ever produced by the Large Hadron Collider, the world's most powerful particle accelerator. However, a team of physicists at the University of Massachusetts Amherst recently hypothesized that something like this could happen when a special kind of black hole, called a "quasi-extremal primordial black hole," explodes.
Our Milky Way galaxy may not have a supermassive black hole at its centre but rather an enormous clump of mysterious dark matter exerting the same gravitational influence.
Scientists say a jet from a previously studied supermassive black hole has grown brighter, becoming one of the most energetic events in the universe.
Researchers have found what might be a little red dot transitioning into its final state, where x-rays burst through its gas cocoon. Others argue the object is nothing special
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There is a lot we have yet to understand about the center of the Milky Way—could it be due to a mass of invisible dark matter?
Dubbed "Jetty McJetface," the tidal disruption event's energy keeps getting brighter and should peak in 2027.
Our Milky Way galaxy may not have a supermassive black hole at its center but rather an enormous clump of mysterious dark matter exerting the same gravitational influence, astronomers say. They believe this invisible substance—which makes up most of the universe's mass—can explain both the violent dance of stars just light-hours (often used to measure distances within our own solar system) away from the galactic center and the gentle, large-scale rotation of the entire matter in the outskirts of the Milky Way.
"If our hypothesized dark charge is true, then we believe there could be a significant population of primordial black holes, which would be consistent with other astrophysical observations, and account for all the missing dark matter in the universe."
A supermassive black hole with a case of cosmic indigestion has been burping out the remains of a shredded star for four years - and it's still going strong.
Learn how a shredded star triggered a black hole jet that evolved into a years-long energy surge that continues to intensify.
A supermassive black hole with a case of cosmic indigestion has been burping out the remains of a shredded star for four years—and it's still going strong, new research led by a University of Oregon astrophysicist shows.