Energy production in stars.

@article{Bethe1968EnergyPI,
  title={Energy production in stars.},
  author={Hans Albrecht Bethe},
  journal={Science},
  year={1968},
  volume={161 3841},
  pages={
          541-7
        }
}
  • H. Bethe
  • Published 9 August 1968
  • Physics
  • Science
FROM TIME IMMEMORIAL people must have been curious to know what keeps the sun shining. The first scientific attempt at an explanation was by Helmholtz about one hundred years ago, and was based on the force most familiar to physicists at the time, gravitation. When a gram of matter falls to the sun's surface it gets a potential energy Epot = −GM/R = −1.91×1015 erg/gm (1) where M = 1.99×1033 gm is the sun's mass, R = 6.96×1010 cm its radius, and G = 6.67×10−8 the gravitational constant. A… 

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