Andromeda Galaxy (the Andromeda Galaxy is one of the closest Galaxy to us, scientists even believe that someday the Andromeda Galaxy will make a collision with our Milky way and completely destroy both of the Galaxies). I learned this on How The Universe
Galaxies light up the night sky in amazing cosmic vista Can you spot the Milky Way and its closest neighbor, Andromeda, in this stunning vertical panorama? Mway and in upper left corner is it the Andromeda ?
Black hole bonanza in 'next door' Andromeda galaxy
The 20 big questions in science From the nature of the universe (that's if there is only one) to the purpose of dreams, there are lots of things we still don't know – but we might do soon. A new book seeks some answers