How Did Harlow Shapley Use the Period-Luminosity Relationship of Cepheid

question 42

Multiple Choice

How did Harlow Shapley use the period-luminosity relationship of Cepheid variables to determine the size of the Milky Way galaxy?

• A) He determined the proper motion of globular clusters in the outer disk of the galaxy.
• B) He found the distance to individual Cepheid variables free floating in the halo.
• C) He found the distance to open clusters found throughout the disk of the galaxy.
• D) He found the distance to globular clusters distributed about the center of the galaxy.

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