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How has the inside of the Earth stayed as hot as the Sun's surface for billions of years?

  • Written by Shichun Huang, Associate Professor of Earth and Planetary Sciences, University of Tennessee
How has the inside of the Earth stayed as hot as the Sun's surface for billions of years?The slice you see cut out of the Earth reveals its core, depicted here in bright yellow.fhm/E+ via Getty ImagesHow has the inside of the Earth stayed as hot as the Sun's surface for billions of years?

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How does the inside of the Earth stay boiling hot for billions of years? Henry,...

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