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expanding universe
5 of the Biggest Puzzles about the Universe
1,367
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7 years ago
How Redshift Revealed the Universe
1,363
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7 years ago
Redshift of distant galaxies
917
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9 years ago
How do we know the Universe is expanding?
967
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9 years ago
Hubble’s Law, the Doppler Effect, and an Expanding Universe
887
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11 years ago
