black holes

The Spektr-RG telescope, launched successfully into orbit on Saturday, aims to chart the first-ever map of the universe in high-energy X-rays.
Astronomers watch the galactic equivalent of a dog with a bone.
“It’s as though the black hole has cleaned its room by throwing flames.”
Gamma Ray Bursts, the result of a slightly different variety of cosmic mishap. When large stars die, they don't go gently into the night. Single stars can implode, or two small, dead stars can collide. Either way, the resulting black hole is celebrated with a brief flash of gamma rays a million trillion times brighter than the Sun. It could damage the atmospheres of planets even light-years away, which would be bad news for any biology.
Here's the answer.