ELI5: If the universe is constantly expanding

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ELI5: If the universe is constantly expanding, how do galaxies collide?

I remember hearing an analogy that the expanding universe is like putting a bunch of dots on a balloon and then inflating it—all of the dots grow farther apart. But then how do galaxies end up colliding? Does gravitational attraction outweigh the expansion?
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ELI5: If the universe is constantly expanding, how do…

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