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expanding universe
5 of the Biggest Puzzles about the Universe
1,328
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7 years ago
How Redshift Revealed the Universe
1,331
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7 years ago
Redshift of distant galaxies
898
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8 years ago
How do we know the Universe is expanding?
948
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9 years ago
Hubble’s Law, the Doppler Effect, and an Expanding Universe
866
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11 years ago
