Multiple Choice
Hubble carried out the determination of the distance to the Andromeda "nebula" (which finally resolved the Shapley-Curtis debate on the nature of "spiral nebulae") by observing
A) pulsars.
B) Cepheid variable stars.
C) the Doppler shift of stars in the "nebula."
D) the main sequence of stars in the "nebula."
Correct Answer:
Verified
Correct Answer:
Verified
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