Episode Details

NASA-funded research reveals Mercury is shrinking faster than we thought—possibly by up to 14 miles in diameter, a 30% contraction larger than previous estimates. As its iron core cools, the planet’s surface wrinkles like a drying grape, hiding the true scale of this ancient geological process. Though Mercury has been contracting since its formation 4.5 billion years ago, new data suggests it’s more active than ever—and surprisingly similar to Earth in its dynamic evolution. The upcoming BepiColombo mission, arriving in November, will help confirm these findings and deepen our understanding of this small but mighty planet.

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