White dwarfs are dense, core remnants of stars that have shed their outer layers and cool over billions of years as they ...

There’s more to the universe than meets the eye ... at the center of a much larger halo of dark matter of unknown composition.” Dr. Ostriker’s work, he said, was “the grandest revision ...

This finding is the closest look ever at hot molecular gas near a black hole from such an early time in the universe, revealing in remarkable detail the conditions of a rapidly growing black hole.