Messier 31 - The Andromeda Galaxy
At a distance of 2.5 million light years from earth, the Andromeda Galaxy is the most distant object humans can see with the naked eye.
In 4 billion years, NASA believes Andromeda will collide with our Milky Way. Astrophysical Journal research shows that the outer gases of Andromeda and Milky way are already touching.
