NASA's Mars rover Curiosity has revealed no trace of methane, a potential sign of primitive life, on the Martian surface, despite past observations of the gas by spacecraft orbiting the Red Planet and from Earth, researchers say.
NASA's Mars rover Curiosity has revealed no trace of methane, a potential sign of primitive life, on the Martian surface, despite past observations of the gas by spacecraft orbiting the Red Planet and from Earth, researchers say.
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