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When astronomer vera rubin began to measure the rotation curves of spiral galaxies in the 1960s, she found?

When astronomer vera rubin began to measure the rotation curves of spiral galaxies in the 1960s, she found?
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When astronomer vera rubin began to measure the rotation curves of spiral galaxies in the 1960s, she found?

User Xmarston
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She found that spiral galaxies were rotating slower than expected.
User Jfocht
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