Observing groups of galaxies collide in X-rays has revealed more about the drastic cosmic occasion
Astronomers propose that between eight and 10 billion years ago, a dwarf galaxy collided with the Milky Way and completely reshaped the galaxy
The previously hidden origins of quasars has been unveiled by the Hubble Space Telescope
If you thought one was enough, scientists believe that some black holes pair up. Find out 5 facts about double black holes here.