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The Milky Way and Andromeda galaxy are on a collision course! In about 3 billion years, the two galaxies will collide. Then over a span of 1 billion years or so after a very complex gravitational dance, they will merge to form an elliptical galaxy.
When will this collision occur? Plausible orbits and models of the Milky Way and Andromeda galaxies suggest that the big event could occur in as soon as 3 billion years. The Sun will still be burning brightly when this collision occurs and maybe life of some sort will still be around on Earth (or at least within the solar system) at that time.