The Violent Andromeda Galaxy Is Set For A Collision With Our Galaxy

(CNN) — 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.
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