The results of the 1920 Shapley-Curtis debate on the nature of "spiral nebulae" were inconclusive.What was really needed to provide an answer to the question was
A) a better idea of the size of the Milky Way Galaxy.
B) a better understanding of interstellar extinction.
C) distances to spiral nebulae.
D) a clearer idea of star formation.
Correct Answer:
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Q21: What assignment is given to a galaxy
Q22: At the conclusion of the Shapley-Curtis debate
Q23: Variable stars,such as Cepheid variables and RR
Q24: The method used by Hubble to determine
Q25: In the Hubble classification scheme for spiral
Q27: In determining the distance to a galaxy
Q28: According to the Hubble classification scheme,an Sa
Q29: Why does the central bulge of a
Q30: The observation by Hubble that demonstrated for
Q31: Distances to a nearby galaxy can be
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