An accidental discovery of two new galaxies, hiding behind clouds of dust in the furthest reaches of the Universe.
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.