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What is the best evidence that the universe is expanding?

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Both blue shifts and red shifts are observed for various objects, indicating relative motion both toward and away from the earth. The Doppler effect is responsible for the red shifts of distant galaxies, and also of quasars , and thus provides the best evidence for the expansion of the universe, as described by Hubble's law.

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Similar questions: How does the Doppler effect prove the universe is expanding? How do we know the universe is expanding? What proves Hubble’s law? What is the best evidence for the expansion of the universe? [ Hide these questions ]

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