Why is dating a large group of stars in a cluster generally more reliable than dating an isolated field star?

Answer

Stars within a cluster share the same age because they formed simultaneously from the same material.

Because all stars in a cluster form at nearly the same time from the same gas cloud, their shared formation date provides an anchor age against which models can be tested.

Why is dating a large group of stars in a cluster generally more reliable than dating an isolated field star?

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