If the universe is expanding and the distances of each galaxies get larger over time then why is our own galaxy (Milkyway) will collide with another galaxy (Andromeda) in the future?
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I believe it’s because Andromeda is considered part of our local group as in the galaxies closest to us are bound by the same gravity and will cause a super galaxy eventually, but any galaxies outside of that influence will eventually fade into oblivion.
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