The suns energy is from fusion, fine makes sense.
But the core is a hot spinning liquid metal generating tremendous amounts of heat. Why hasn’t it cooled down? How is it replenishing its energy?
In: Planetary Science
It’s mostly energy left over from it’s formation. Some comes from radioactive decay of uranium etc.
When you get a mass this size being crushed into a sphere by it’s own gravity, especially in an early solar system that’s already quite hot, you end up with an incandescent ball of magma. Luckily, the surface cooled enough over time to become solid.
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