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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Average distances are getting larger, but individual galaxies already close to each other can be moving towards each other faster than the space between them is expanding (this is why galaxies are getting further away).
It’s like lots of ants crawling over a balloon you’re inflating, maybe ants on opposite sides of the balloon will never meet (assume you can inflate the balloon infinitely), but ants close to each other could still meet up.
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