If the universe is expanding, how can galaxies collide?

如果宇宙在膨胀，星系怎么会碰撞？

Two galaxies are shown mid-collision against a background of more distant galaxies.

2026-02-06 1142词困难

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I love this! For one thing, it shows that people really are curious about science, and you have to dig that. For another, it gives me a chance to explain counterintuitive concepts that are probably bugging other people as well.

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