What does it mean for a star to be on the Main Sequence (MS)? Explain where stars of various masses lie on the MS and how their lifetimes depend on mass. How can you use this to figure out the age of a star cluster (assuming all the stars in a cluster were born at the same time)?

What does it mean for a star to be on the Main Sequence (MS)? Explain where stars of various masses lie on the MS and how their lifetimes depend on mass. How can you use this to figure out the age of a star cluster (assuming all the stars in a cluster were born at the same time)?

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