In the 1920s,Edwin Hubble began answering the question about the nature of spiral "nebulae" when he discovered Cepheid variables in the:
A) Milky Way Galaxy.
B) Whirlpool Galaxy (M51).
C) Andromeda Galaxy (M31).
D) Small Magellanic Cloud.

Name: In the 1920s,Edwin Hubble began answering the question about the nature of spiral "nebulae" when he discovered Cepheid variables in the: A) Milky Way Galaxy. B) Whirlpool Galaxy (M51). C) Andromeda Galaxy (M31). D) Small Magellanic Cloud.
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The Answer is C

In the 1920s,Edwin Hubble Began Answering the Question About the Nature