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"Would the radiogenic warming ever shut down?"Eventually, in principle. But there's plenty of bismuth and such in the world, and they have seriously long decay half lives. http://en.wikipedia.org/wiki/List_of_radioactive_isotopes_by_half-life#1030_secondsBut, even with nothing around it keeping it warm, the Earth (or anything else) would never quite cool to 0K. The cooler it got the less heat it would radiate, so the more slowly it would cool down.
There's also the uncertainty principle that prevents us from ever being able to measure anything as absolute 0K - I think
You would still have zero point energy at 0K. This is a quantum effect
On reflection, I think I should have distinguished between zero energy and zero point energy. (?)