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Originally posted by LostNemesis
I could be totally wrong here.
Originally posted by Sam Vimes
Is it possible that some planets are old stars? Cooled down, shrunk and snowballing through the void picking up stuff. I mean, how did the core of the earth get so hot?
There are three main sources of heat in the deep earth: (1) heat from when the planet formed and accreted, which has not yet been lost; (2) frictional heating, caused by denser core material sinking to the center of the planet; and (3) heat from the decay of radioactive elements.