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When astronomer vera rubin began to measure the rotation curves of spiral galaxies in the 1960s, she found?
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Jul 25, 2018
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When astronomer vera rubin began to measure the rotation curves of spiral galaxies in the 1960s, she found?
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Xmarston
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She found that spiral galaxies were rotating slower than expected.
Jfocht
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Jul 29, 2018
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