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OpenStudy (anonymous):
What observations were used by Edwin Hubble to show that the universe is expanding?
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OpenStudy (anonymous):
A. The distance to a galaxy is inversely proportional to its apparent size. B. The distance to a galaxy is proportional to its luminosity. C. The distance to a galaxy is proportional to its velocity relative to the Milky Way. D. The distance to a galaxy is proportional to its rotational velocity.
OpenStudy (anonymous):
that will be C
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