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Main sequence turnoff
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<p>The turnoff point for a <a href="/facts/Star/PFbd6ICx">star</a> refers to the point on the <a href="/facts/Hertzsprung%E2%80%93Russell_diagram/53YWnCvR">Hertzsprung–Russell diagram</a> where it leaves the <a href="/facts/Main_sequence/DJ3Wq8kd">main sequence</a> after its main fuel is exhausted – the main sequence turnoff. </p><p>By plotting the turnoff points of individual stars in a <a href="/facts/Star_cluster/Crs7Y6me">star cluster</a> one can <a href="/facts/Main_sequence/DJ3Wq8kd">estimate the cluster's age</a>. </p>