[AR] Re: Freeman Dyson, RIP

  • From: roxanna Mason <rocketmaster.ken@xxxxxxxxx>
  • To: arocket@xxxxxxxxxxxxx
  • Date: Tue, 10 Mar 2020 14:23:53 -0700

Is the sun self regulation, i.e. exhibits positive stability in a thermal
feedback loop or the opposite, runaway fusion?

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On Tue, Mar 10, 2020 at 1:20 PM Henry Spencer <hspencer@xxxxxxxxxxxxx>
wrote:

On Tue, 10 Mar 2020, Norman Yarvin wrote:
...the message will get through eventually.  If the
outer layers get hotter and hotter, eventually the outward heat flow
will
start to slow, and the core temperature will start to rise.

Still, the core temperature of the sun is millions of degrees.
Raising the surface temperature by a mere thousand degrees would have
a hard time changing it significantly.

If you've enclosed the whole thing in a mostly-reflective sphere, it's not
going to stop with a mere thousand degrees.  Given time, temperatures
inside the sphere will rise until either radiant heat emitted outward by
the sphere equals energy generation inside, or something breaks (e.g. the
sphere starts to melt and disintegrates).

Henry


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