Four billion years from now, the Milky Way galaxy as we know it will cease to exist. Our Milky Way is bound for a head-on collision with the similar-sized Andromeda galaxy, researchers announced today ...

Astronomers have long known that the Andromeda galaxy, aka Messier 31, a swirling city-state of a trillion stars — plus all the accouterments of gas, dust, dark matter and black holes — is rumbling ...

Dr. Pierre Martin and his team created an animation showing two galaxies colliding more than 440 million years ago.

Astronomers have discovered a flattened structure of matter around the Milky Way that explains the unusual motion of nearby ...

A look at Edwin Hubble’s role in confirming that the Andromeda Galaxy lies beyond the Milky Way, helping expand our understanding of the universe.