[prohornblower]

Another thing to consider is thermal lag of the Sun. This is about a month to a month-and-a-half generally.

In other words, the Sun is at its extreme on the solstices (late Jun/Dec), but the Earth is warmest in late July-ish, and coldest in late January-ish.

So the troposphere is retaining about a month worth of sun heat at all times. This is when the Sun is continually pounding on it each day, though. If it went out, the surface of the Earth should lose almost all of its Sun heat due to radiation in just a week or two.

I'll admit, I'm not too knowledgable about the center of the Earth, or what it would be doing. If it were warm enough for millions of years, though, I don't see how civilization could utilize enough manpower in such a short time to create any kind of sustainable univeral dwelling down there.

I would love to watch a movie about this. And The Day After Tomorrow didn't cut it. lol.