A distant galaxy should have a back hole that is billions of times more massive than the Sun, but it's nowhere to be found. Where is it?
The European Gaia spacecraft unveils new details about a cataclysmic collision in our galaxy’s distant past.
The Milky Way's edge is still wobbling due to a collision with a dwarf galaxy loaded with dark matter.
'Cold quasars' offer an unprecedented look at the transition between active star-forming galaxies and dead galactic bodies.
The Hubble Space Telescope snapped detailed images of Messier 75, which is part of the 'Gaia Sausage.'
The picture is a preview of the impending collision between the Milky Way and Andromeda galaxies in four billion years.
It's by far the longest gas trail ever discovered, and it weighs more than the Milky Way and Andromeda combined.