Leopard Spots on Mars? NASA’s Big Discovery, Explained | Peter Girguis

Particles of Thought

Nov 10, 2025•6 min

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Episode description

Could a Martian rock hold the most promising sign of life beyond Earth? Microbiologist Peter Girguis unpacks NASA’s stunning discovery of ‘leopard spots’ on a rock from Mars’s Jezero Crater—and why they look eerily like the handiwork of microbes on our own planet.

For more, check out the extended interview with Peter Girguis.

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