HD 222697 is a 2.7 solar mass star that appears young and bright despite being in a 2.5 billion-year-old star cluster, because it formed from a violent collision between two stars rather than through normal stellar aging; this merger created a hybrid star with a metal-poor surface like a newborn but a metal-rich interior like an old giant, spinning at 180 km per second as evidence of its violent origin, with such collisions occurring roughly once every 1,000 years to rejuvenate star clusters.
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The Star That Shouldn't Exist! ππ₯Added:
A 2.7 solar mass star lives inside a 2.5 billion-year-old graveyard. HD222697 looks shockingly young and bright inside this ancient cluster of dead stars. Its surface is metal poor like a newborn, but its inside is metal rich like an old giant. This mix happened because two stars collided directly instead of one star aging slowly over time. Scientists found this hybrid in 2011, but waited until 2019 to confirm the merger. The star spins at 180 km per second proving a violent crash created it. Such collisions happen roughly once every 1,000 years to constantly rejuvenate the cluster. Do you think space is peaceful or a violent workshop? Comment your answer below and subscribe.
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