The Curiosity Rover detected a steady stream of methane from Gale Crater, possibly originating deep underground or released when the rover moves over cracks, challenging the search for life on Mars.
Methane on Earth is a sign of life, but on Mars, it might be related to perchlorates, toxic salts that can build up in the regolith and evaporate from ice below the surface, forming a shell-like crust.
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