For elderly stars, the fountain of youth may be only a collision away.
Close-up of the core of the Milky Way globular cluster NGC 6397 reveals several blue
straggler stars, each labeled with the prefix BSS. Peter Edmonds/NASA
Evidence for the rejuvenating power of collisions comes from studying bright, young-looking stars residing in globular clusters, the oldest stellar groupings in the Milky Way.
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