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April 2, 2015

Homework Help: Cosmology

Posted by qwerty on Tuesday, January 8, 2013 at 8:08pm.

What observations were used by Edwin Hubble to show that the universe is expanding?

- The distance to a galaxy is proportional to its luminosity.
- The distance to a galaxy is inversely proportional to its apparent size.
- The distance to a galaxy is proportional to its velocity relative to the Milky Way.
- The distance to a galaxy is proportional to its rotational velocity.

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