Harlow Shapley determined the position of the Sun in the galaxy by measuring the distances to 93 globular clusters of stars. How did Shapley obtain the distances to these very distant clusters?
A) He measured the apparent brightness and pulsation periods of RR Lyrae stars in the clusters.
B) He plotted the apparent brightness and spectral classes of a sample of the stars in each cluster on a Hertzsprung-Russell diagram.
C) He measured the proper motion and radial velocity of each globular cluster.
D) He measured the apparent brightness of the brightest red giant stars in each cluster.
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