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Astronomers mining NASA’s Chandra archive found 84 previously overlooked “hypersoft” sources across six galaxies, including Andromeda, that appear to emit most of their enormous energy in extreme ultraviolet—radiation that could ionize interstellar gas and influence how quickly galaxies form stars. They remained hidden because their X-rays fall almost entirely below 0.3 keV, while intervening gas absorbs their ultraviolet light.
2+ day, 6+ hour ago (761+ words) A Chandra archive search found 84 sources visible almost only below 0.3 keV, exposing a model-dependent reservoir of extreme-ultraviolet radiation in six nearby galaxies....
84 Hypersoft X-Ray Sources Found in Six Galaxies
4+ day, 2+ hour ago (1153+ words) The objects are unusually soft in X-rays but bright in extreme ultraviolet light—exactly the combination that makes them difficult to find and potentially important to the history of stars and galaxies. A galaxy can be full of powerful objects…...
Traversing the Galactic Centre in space and time - Nature Astronomy
1+ week, 4+ hour ago (159+ words) Nature Astronomy (2026) Cite this article At IAU Symposium 405 in Brno, Czech Republic, the Galactic Centre emerged as a nearby laboratory for galactic nuclei, which links the central supermassive black hole, dense stellar populations and multiphase gas into a connected ecosystem…...
The bubbling surface of doomed supergiant star Betelgeuse has been revealed like never before
2+ week, 5+ day ago (285+ words) Stargazing tips, cosmic events and expert insights on the universe "Its eventual fate as a supernova makes it fascinating to know what it actually looks like now." Betelgeuse may be a well-known and often-studied stellar object, but that doesn't mean…...
The Fastest Star on Record Has Been Found Hurtling Past Our Galaxy's Black Hole
3+ week, 5+ day ago (113+ words) In the extreme environment at the heart of the Milky Way galaxy, things can get a little hinky....
Scientists find the fastest star in our galaxy
3+ week, 4+ day ago (387+ words) Astronomers have found the fastest star in our galaxy – and is close to its black hole that it can feel its rotation. It comes closer to that black hole than any other star seen before. As such, scientists believe it…...
Telescope spies the fastest star in the Milky Way zipping around a black hole
3+ week, 4+ day ago (255+ words) The star is zipping around the black hole, reaching speeds of about 15,534 miles per second (25,000 kilometers per second). That's 100,000 times faster than a commercial plane. "That star is really, extremely fast," said astronomer Stefan Gillessen with the Max Planck Institute…...
The Curious Case of Rapidly Rotating Stars - presented by Sadie Kobos; Graduate Student; Department of Physics and Astronomy | Iowa Now | The University of Iowa
3+ week, 5+ day ago (155+ words) Iowa Now The Curious Case of Rapidly Rotating Stars - presented by Sadie Kobos; Graduate Student; Department of Physics and Astronomy Please join us for the Astronomy Public Talk series, where we host short, accessible talks on a wide range of…...