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19 July, 13:18

Edwin Hubble discovered that:

Cepheids have patterns of brightness.

Stars have absolute and apparent magnitudes.

The planets move in elliptical orbits around the sun.

Galaxies in the universe are moving away from the earth.

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  1. 19 July, 17:00
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    The correct answer is: Galaxies in the universe are moving away from the earth.
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