Blue stragglers are created by the merger of two low-mass stars. But they have two different views of how these stars interact to create blue stragglers. One merger theory proposes that a violent collision of two unrelated stars creates a blue straggler. Another hypothesizes that a slow coalescence of a gravitationally bound pair creates the straggler star.

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https://hubblesite.org/contents/news-releases/1997/news-1997-35.html