> The temperature of Heaven can be rather accurately computed.  Our
> authority is Isaiah 30:26, "Moreover, the light of the Moon shall be as
> the light of the Sun and the light of the Sun shall be sevenfold, as
> the light of seven days."  Thus Heaven receives from the Moon as much
> radiation as we do from the Sun, and in addition 7*7 (49) times as much
> as the Earth does from the Sun, or 50 times in all.  The light we
> receive from the Moon is one 1/10,000 of the light we receive from the
> Sun, so we can ignore that ... The radiation falling on Heaven will
> heat it to the point where the heat lost by radiation is just equal to
> the heat received by radiation, i.e., Heaven loses 50 times as much
> heat as the Earth by radiation.  Using the Stefan-Boltzmann law for
> radiation, (H/E)^4 = 50, where E is the absolute temperature of the
> earth (-300K), gives H as 798K (525C).  The exact temperature of Hell
> cannot be computed ... [However] Revelations 21:8 says "But the
> fearful, and unbelieving ... shall have their part in the lake which
> burneth with fire and brimstone."  A lake of molten brimstone means
> that its temperature must be at or below the boiling point, 444.6C.  We
> have, then, that Heaven, at 525C is hotter than Hell at 445C.
>                 -- From "Applied Optics" vol. 11, A14, 1972