.Clusters of celebrities specified the interstellar medium ablaze in the Andromeda Universe regarding 2.5 million light-years away. Also called M31, Andromeda is the Milky Way's closest primary galaxy. It measures roughly 152,000 light-years around and, with just about the exact same mass as our home galaxy, is gone to a collision along with the Milky Way in 2-4 billion years. For the time being, Andromeda remains an object of research study for several stargazers.