Today in Astronomy 142 - Astro Pas Rochester
Today in Astronomy 142 - Astro Pas Rochester
Today in Astronomy 142 - Astro Pas Rochester
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How long would the Sun’s present heat last?Plasma energy density at center of Sun (energy density of electron gasthere, considered aga<strong>in</strong> to be ideal):Energy density of light, which is about to leak away:We showed last lecture that it takes about t = 31000 years for a photon toleak from center to surface, so the heat lastsThus some process must be replac<strong>in</strong>g the energy that leaks away.<strong><strong>Astro</strong>nomy</strong> <strong>142</strong> 27
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