What is the best way to estimate the age of a star cluster?
A) Plot the stars on a Hertzsprung-Russell diagram, and see which stars are still on the main sequence.
B) Measure the motions of the stars in the cluster, and compare the measurements with theoretical models.
C) Measure the heavy element abundance for the stars in the cluster.
D) Count the number of T Tauri stars in the cluster.
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