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2 April, 21:30

What did Edwin Hubble discover about galaxies that allowed him to determine the expansion rate of the universe?

A. The farther away a galaxy was, the less its light was shifted toward the red end of the spectrum.

B. The farther away a galaxy was, the more its light was shifted toward the blue end of the spectrum.

C. The farther away a galaxy was, the more its light was shifted toward the red end of the spectrum.

D. The light from a galaxy was shifted a uniform amount toward the red end of the spectrum, regardless of its distance from Earth.

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  1. 3 April, 00:40
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    The farther away a galaxy is, the more its light

    is shifted toward the red end of the spectrum. (C)
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