[FredZarguna]

The idealization is poor because the sun is not even close to being a black body at its surface temperature. If it were, it would not be possible for the sun's atmosphere to be so much hotter than its surface (that would, in fact, be a Second Law violation).

[dr_lew]

The idealization is poor because the sun is not even close to being a black body at its surface temperature. If it were, it would not be possible for the sun's atmosphere to be so much hotter than its surface (that would, in fact, be a Second Law violation).

A) It's an excellent idealization of the appearance of the sun, and not intended as a dynamic model of the interior.

B) None of this has anything to do with the solar system being an OPEN system ! Talk about nit picking ! I was pointing out that IF the solar system were closed, it would be uniformly hot. Then you say, oh no, much hotter than that! and the solar surface would disappear ...

So how is this supposed to support your completely untenable assertion that the solar system is thermodynamically CLOSED ????