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Scientists trace origin of ultra-energetic 'Amaterasu' cosmic ray
Scientists found the Amaterasu particle, an ultra-energetic cosmic ray, likely came from a nearby star-forming galaxy, not an empty void.
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Scientists found the Amaterasu particle, an ultra-energetic cosmic ray, likely came from a nearby star-forming galaxy, not an empty void.
Astronomers used Hubble and Chandra to hunt for wandering black holes in dwarf galaxies. Finding them could reveal a "fossil record" of early black hole seeds, helping explain how supermassive black holes grew so quickly in the early universe.
Astronomers observed a massive star in Andromeda skip a supernova and collapse directly into a black hole, providing the most detailed view yet of how stellar black holes form.