Still, if you get to see the Andromeda Galaxy, consider that you are seeing light 2.5 million years old, dating from when the human species was just beginning to establish a fragile foothold on ...

The Andromeda Galaxy and the Milky Way are the closest neighbors despite that incredible distance. Still, without a doubt, Andromeda is a larger galaxy, possibly twice the diameter of our Milky Way.

You might wonder what would happen if our disk-shaped spiral galaxy were to one day collide with Andromeda, which is over twice the size of the Milky Way.

While Andromeda, the closest galaxy to our Milky Way, is moving toward us, further measurements of other galaxies by Hubble and Belgian astronomer Georges Lemaître subsequently found that more ...