Episode Details

Earth’s core is cooling twice as fast as scientists once believed—200 degrees Celsius every billion years. This rapid chill threatens to slow the churning molten iron that generates our planet’s magnetic shield, potentially weakening it over time. Think of the core as a giant engine: if its heat fades faster than expected, the whole system could shift. Researchers used ancient rock data and high-pressure mineral analysis to uncover this dramatic revision, reminding us that even Earth’s deepest layers are dynamic—and evolving faster than we thought.

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