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In the 1920s Edwin Hubble Began Answering the Question About

Question 133

Multiple Choice

In the 1920s Edwin Hubble began answering the question about the nature of spiral "nebulae" when he discovered Cepheid variables in

A) the Milky Way Galaxy.
B) the Whirlpool Galaxy (M51) .
C) the Andromeda Galaxy (M31) .
D) the Small Magellanic Cloud.

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