The Andromeda Galaxy or Messier 31 (M31) is a large spiral galaxy about two and a half million light years in distance from our own Milky Way galaxy. The Andromeda Galaxy is so called because it lies in the constellation Andromeda and on a dark clear night it is the most distant object that can be seen with the unaided eye. Low power binoculars will reveal M31 as a fuzzy blob.
The Andromeda Galaxy has two satellite galaxies, M32 and M110. All three Messier objects are known collectively as The Great Andromeda Nebula.