Active galactic nuclei are supermassive black holes at the center of certain galaxies. As matter falls into these black holes ...
NASA's Chandra and NuSTAR telescopes have teamed up to study a supermassive black hole-powered quasar that could have played ...
Strange x-ray pulses hint at a surprisingly long-lived white dwarf orbiting precariously close to a supermassive black hole ...
Scientists have detected emanating from the nucleus of a galaxy relatively close to our Milky Way flashes of X-rays gradually ...
The newly discovered "blazar," which has a mass equal to 700 million suns, is the oldest of its kind ever seen and changes ...