Blue stragglers

Blue stragglers is a class of stars on open or globular clusters that are bigger and bluer than the rest. They are unique as they stand out in old, dense stellar systems that are devoid of blue (high-mass) stars which has very short lifespan.
Indian researchers have conducted the first-ever comprehensive analysis of blue stragglers. They found that half of the stars they anaylsed may have formed from a close binary companion star, one-third are likely formed through collisions of two stars and the remaining are formed through interactions of more than 2 stars.

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