hottest part of Sun and hottest part of a fireplace question & observation

In sci.physics, Archimedes Plutonium

wrote
on 26 Jan 2004 23:23:57 -0800
:
Now I am not sure of my observation that the only blue flame is near
the outer topmost edge of the spent log. Blue near the top surface,
more reddish below the blue and then almost white in the middle. That
is what I see but perhaps my sight is at fault.

Now with the Sun, if I have it correct near the surface is the hottest
part of the Sun.

So my question is why the blue, and the blue is the hottest, why the
blue in a log fireplace on the surface of the log? Is it because the
density of oxygen is greatest near the surface whereas going inside
the spent log less oxygen and thus not as hot.

If oxygen density is the answer for why blueflame on top surface, then
what is the answer for the Sun as to why its outer layer is the
hottest? My mind would like to say it is also a matter of *oxygen
density* greatest on the outer surfaces of the Sun but not sure if
that is the case.

Does an expert on the Sun want to weigh in.

Archimedes Plutonium
whole entire Universe is just one big atom where dots
of the electron-dot-cloud are galaxies

Power output of entire sun: 3.94 * 10^26 W
Mass of sun: 1.9862 * 10^30 kg
C + O2 = CO2 enthalpy: -643 kJ/mol or 14.6 MJ/kg
Fuel consumption rate, assuming C + O2 reaction: 2.69*10^19 kg/s
Time of life assuming C + O2: 2340 years
Probability this scenario makes any sense: 0

Actual hydrogen consumption rate: 6*10^11 kg/s
Actual hydrogen percentage: 92%
Time of life assuming pure H fusion and constant rate: 96.5 billion years
Actual estimated time of life: 5 billion years
Estimated time before Earth becomes inhabitable: 1 billion years

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