Andromeda Galaxy

The Andromeda Galaxy is the sister galaxy of the Milky Way and is the closest galaxy to us. With a diameter of 220,000 light-years, the Andromeda Galaxy is slightly larger than the Milky Way, but has 2-3 times more stars than the Milky Way. The Andromeda Galaxy is expected to collide with the Milky Way in about 4.5 billion years. The two galaxies are expected to merge into a giant lenticular galaxy called Milkdromea.