Question

which galaxy will collide with the Milky Way in several billion years

Answer 1

The Andromeda Galaxy (M31) is the galaxy expected to collide with the Milky Way in about 4 to 5 billion years. This collision is predicted to result in a merging of the two galaxies, ultimately forming a larger galaxy often referred to as "Milkomeda" or "Milkdromeda." The collision is expected to influence the structure and star formation in both galaxies significantly, but due to the vast distances between stars, direct star collisions will be rare.