At the equator on a Martian summer afternoon, temperatures can reach a tolerable 20°C — but the moment the sun sets, the near-absent atmosphere bleeds the heat away and the surface drops to −84°C by morning, a daily swing no unprotected human body could survive.
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Mars can briefly produce Earthlike ground temperatures in equatorial sunlight, then plunge toward −84°C before dawn. The physics behind that swing exposes just how alien the planet remains.
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