Energy Sources in Stars (§10.3)
Energy Sources in Stars (§10.3)
Energy Sources in Stars (§10.3)
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<strong>Energy</strong> <strong>Sources</strong> <strong>in</strong> <strong>Stars</strong> (§10.3)What makes a star sh<strong>in</strong>e?Sun’s s <strong>Energy</strong> OutputL sun = 4 x 10 26 W (J s -1 )sun 4.5 x 10 9 yr (1.4 x 10 17 s) - oldest rocks - radioactive dat<strong>in</strong>gt sunL sun ~ constant over geological timescale (fossil evidence)Therefore total energy output E tot = L sun x t sun = 6 x 10 43How might the Sun have generated this energy?43 J
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