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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.
18+ hour, 9+ min 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....
Hubble and Webb Teamed Up on Distant Solar System Bodies and Found Fewer Tiny Ones Than Some Models Predicted
2+ day, 12+ hour ago (840+ words) NASA announced the joint Hubble and Webb results on September 8, alongside two complementary papers published that day in The Astronomical Journal. NASA says it is the first time the two telescopes have been used jointly to study Trans-Neptunian Objects, and…...
NASA found a strange cosmic object that may explain how black holes become supermassive
2+ day, 15+ hour ago (900+ words) Little red dots should shine in X-rays if black holes power them. None did, until Chandra found one 11.8 billion light-years away that does. Astronomers have found a single object in the constellation Ursa Major that behaves like nothing else in…...
"Never encountered objects that act like this": NASA???s Chandra reveals a new class of cosmic objects
2+ day, 20+ hour ago (687+ words) "Never encountered objects that act like this": NASA’s Chandra reveals a new class of cosmic objects starlust.org "Never encountered objects that act like this": NASA’s Chandra reveals a new class of cosmic objects Scientists have found an entirely new…...
Using Helium, Astronomers Blow Certainty Into Early Big Bang Conditions
3+ day, 7+ hour ago (707+ words) New observations regarding the composition of distant galaxies reveal insights into the earliest phases of the universe that confirm decades of scientific understanding of the elements and particles produced by the Big Bang, according to a new study. Astronomers did…...
Helium Study Sheds Light on Early Big Bang Conditions
3+ day, 15+ hour ago (537+ words) New observations regarding the composition of distant galaxies reveal insights into the earliest phases of the universe that confirm decades of scientific understanding of the elements and particles produced by the Big Bang, according to a new study. Astronomers did…...
Neutron Star or Black Hole? How Astronomers Tell
3+ day, 15+ hour ago (556+ words) A brilliant X-ray source is not automatically a black hole. Matter falling toward a neutron star can also become intensely luminous, and some neutron stars have surprised astronomers by producing far more radiation than expected. Identifying the object requires evidence…...
COSMOS-z3.1-A: Ancestor of a 5,000-Milky-Way Supercluster
3+ day, 22+ hour ago (207+ words) Astronomers have found COSMOS-z3.1-A, the most distant known ancestor of a galaxy supercluster, with a mass of about 5,000 Milky Ways, using the ODIN survey and the Blanco telescope in Chile. Sources disagree on how old the universe was when…...