We can determine the age of a star cluster because stars of different masses go through their lives at different rates.

Name: We can determine the age of a star cluster because stars of different masses go through their lives at different rates.
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This is true. The main sequence lifetime of a star depends on its mass, with more massive stars having shorter lifetimes. By observing the main sequence turnoff point in a star cluster, astronomers can estimate the age of the cluster.

We Can Determine the Age of a Star Cluster Because