M31: The Andromeda Galaxy
Andromeda (M31) is the closest major galaxy to our own, the Milky Way. One day, billions of years from now, Andromeda will collide with the Milky Way. With a distance of over 2 million light years to cover, we have a long, long time before we’ll see any significant changes in the night sky.
Image credit and copyright: Robert Gendler