A wonderful little fact about the maximum power density inside the sun (spoiler: about the same as inside a compost pile!) ht @nattyoverhttps://twitter.com/chris_w_walter/status/1223021681918132224 …
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Suppose you have fixed power density, and the sun is of (variable) radius r. The energy flux at the surface - the thing frying you - scales as power density * volume / surface. That's proportional to the radius. The Sun is just a really, really big compost heap!
I think it's a bit similar to the reason semiconductor chips are mostly 2d: heat and the ability to dissipate heat both scale with area. If they were 3d, the heat produced would scale with volume, but the dissipation would scale with area, and they'd melt.
Aren't both the pressure and temperature still insanely high inside the sun? The energy production is just the *additional* energy released by fusion, not the total energy.
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