How does red shift (Galaxies moving away at various speeds) tell that the universe is expanding?

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How does red shift (Galaxies moving away at various speeds) tell that the universe is expanding?

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It’s because, by a certain distance, they’re *all* moving away from us at a very predictable rate. Objects at opposite ends of the universe, but at the same distance away from us would have no other way to be moving at approximately the same speed away from us.

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