There’s a problem with dark matter, and two possible solutions: bright, luminous supernovae, or dark matter itself.
Most galaxies are either star-forming disks, or red, dead spheroids. But, have galaxy clusters now shown that this divide isn’t quite so clear?
A satellite of Andromeda is missing an important ingredient — so where did it go?
Cosmic filaments are some of the biggest structures in the Universe. Now, we’ve learned that they’re spinning around in space.
The Milky Way’s disc is made up of two components — but where did they come from?