Main sequence
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| definition | An evolutionary stage in the life of a star when it generates its energy by the conversion of hydrogen to helium via nuclear fusion in its core. Stars spend 90% of their life on the main sequence. On the Hertzsprung-Russell diagram it appears as a track running from top left (high temperature, high luminosity, high mass) to lower right (low temperature, low luminosity, low mass). | ||||||||||||||||
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| contributor | AAS_Frey.Katie original | ||||||||||||||||
| creator | AAS_Frey.Katie original | ||||||||||||||||