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Blue straggler
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<p>A blue straggler is a type of <a href="/facts/Star/PFbd6ICx">star</a> that is more <a href="/facts/Luminosity/1tdhpk9l">luminous</a> and <a href="/facts/Stellar_classification/dYrIuK9H">bluer</a> than expected. Typically identified in a <a href="/facts/Stellar_cluster/Crs7Y6me">stellar cluster</a>, they have a higher <a href="/facts/Effective_temperature/RY30DaSY">effective temperature</a> than the <a href="/facts/Main_sequence_turnoff/tS24RBYd">main sequence turnoff</a> point for the cluster, where ordinary stars begin to evolve towards the <a href="/facts/Red_giant_branch/15Pg1F1F">red giant branch</a>. Blue stragglers were first discovered by <a href="/facts/Allan_Sandage/Qk1kRoTm">Allan Sandage</a> in 1953 while performing <a href="/facts/Photometry_(astronomy)/fnV9JdSa">photometry</a> of the stars in the globular cluster <a href="/facts/Messier_3/XADLJ94p">M3</a>. </p>