Observations of star clusters in the Milky Way show that collisions between stars as well as mass flow within binary systems can explain how the peculiar family of blue straggler stars came to be born.
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Davies, M. Stellar revival in old clusters. Nature 462, 991–992 (2009). https://doi.org/10.1038/462991a
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DOI: https://doi.org/10.1038/462991a
