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Rights: JPL-Caltech<br>National Aeronautics and Space Administration (NASA) Published 24 October 2017 Size: 61 KB Referencing Hub media

An average or medium star is less than 3 times the mass of the Sun. Stars are powered by nuclear fusion in their cores, mostly converting hydrogen into helium and liberating tremendous amounts of energy.

Acknowledgement: JPL-Caltech National Aeronautics and Space Administration (NASA)