.Sets of superstars set the interstellar medium ablaze in the Andromeda Universe about 2.5 million light-years away. Also called M31, Andromeda is actually the Galaxy's closest primary universe. It measures approximately 152,000 light-years across and, with nearly the same mass as our home universe, is actually gone to a crash with the Galaxy in 2-4 billion years. Meanwhile, Andromeda stays an object of research study for numerous stargazers.