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

question 103

Multiple Choice

How did Harlow Shapley use the period-luminosity relationship of RR Lyrae 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 distances to individual variables free floating in the halo.
• C)He found the distances to open clusters found throughout the disk of the galaxy.
• D)He found the distances to globular clusters distributed about the center of the galaxy.

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