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Venus' crust has no tectonic movement, indicating that very little (comparatively speaking) heat is moved from inside the core through the mantle to the crust and beyond. Venus has also gone through several "reformations" which added large amounts of energy to it near its beginning. Venus also has a lower mass and thereby a lower core density, resulting in less nuclear activity and less energy released via that mechanism.

Because of these factors, Earth has lost more heat than Venus over the billions of years since their formation.

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Q: Why is Venus' core much hotter than Earth's?
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