The Andromeda galaxy is 2.54 million light years away from Earth, which means that it takes 2.54 million years for light from Earth to reach it. This distance is an accepted average of the results of separate studies of the distance.
The Andromeda galaxy is the closest spiral galaxy to the Milky Way and can be seen with the naked eye. It is also one of the brightest objects in the sky, with an apparent magnitude of 3.4. The Andromeda galaxy has roughly the same mass as the Milky Way but contains twice the number of stars, estimated at around one trillion. Astrologists predict that in 3.75 billion years, the Andromeda Galaxy will collide with the Milky Way, forming a large, elliptical galaxy.