[E. Pluribus Unum]

Let's do a little thought-experiement: "What would the global temperature be if there were no sun?"

Anyone?

Buehler?

[posterchild]

Oooh Ooooh I know, pick me.
Al Gore says the earth ‘has a fever’ and the core is ‘millions of degrees’ (C or F?). If it has a fever it will have to go under a blanket of CO2 and overheat and be even warmer than now, perhaps a half million degrees.

[chimera]

Probably just a little above the boiling point of nitrogen. Internal heat sources (radioactive decay as well as volcanic heat) would likely be enough to keep nitrogen from freezing out. That would provide some measure of insulation, like a blanket surrounding the planet. But we’d all be a bit chilly without artificial heat sources.