How did the Earth’s core stay as hot as the sun’s surface for billions of years?

How did the Earth’s core stay as hot as the sun’s surface for billions of years?

This article was originally published on The conversation. (opens in new tab) The publication contributed the article to Space.com’s Expert Voices: Op-Ed & Insights.

Shichun Huang (opens in new tab)Associate Professor of Earth and Planetary Sciences, University of Tennessee.

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