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What Happens When Galaxies Collide?
The Andromeda galaxy is falling towards us because they're both in a common gravitational potential. And that will collide with our galaxy in about four billion years. But it'll be less a collision and more of a dance, because there'll be like a swirling situation. Well, it's swirling, but eventually there'll be to be emerged, they'll go through each other and then merge.