Solar Corona Temperature
How can the corona be much hotter than the surface of the sun?
This is a very good question. The answer is that the corona is very much
thinner than the rest of he Sun. There are hardly any molecules in it! So
it is easy for it to heat up to millions of degrees, while heating up your
own room, with squillions of molecules about, is much harder.
David H,. Levy
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Update: June 2012