why is earths core so hot? Is it just because it “hasn’t cooled down yet“?

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why is earths core so hot? Is it just because it “hasn’t cooled down yet“?

In: Physics
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The Earth’s core was hot to start with. It has been slowly cooling, but a lot of heat is generated by radioactive elements in the core decaying. This has kept it hotter for much longer than the “baked potato” Earth simulation would predict.