This video about Messier 50 (M50 or NGC 2323) looks at gyrochronology of stars.
Papers referred to are: http://arxiv.org/abs/0810.5110 and https://arxiv.org/abs/1309.7851
Discussed by Dr Meghan Gray at the University of Nottingham.

More Messier objects: http://bit.ly/MessierObjects

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Video by Brady Haran