Astronomers predict that in about four billion years, the Andromeda galaxy will collide with our own galaxy, the Milky Way. The Andromeda galaxy is our largest and closest neighbor in the universe.
Galaxies are more competitive with each other than friendly. To keep growing, Andromeda had a voracious appetite in the past. Being such a large galaxy, Andromeda was surrounded by smaller galaxies. It's expected to have consumed hundreds of them over the last few billion years. Andromeda also gobbled up M32p, once the third largest galaxy behind Andromeda and the Milky Way and considered the Milky Way's long-lost sibling.
So, what happens to Earth when the inevitable collision between two massive galaxies occurs?"I think it's unlikely the Earth will be physically destroyed by the collision with Andromeda," Mackey said."It's not out of the question, but in general the stars in galaxies are spaced sufficiently sparsely that direct collisions between stars are rare.
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