Hubble Carried Out the Determination of the Distance to the Andromeda

question 195

Multiple Choice

Hubble carried out the determination of the distance to the Andromeda "nebula" (which finally resolved the Curtis-Shapley 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."

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