Measurements of methane in the Martian atmosphere made by the Tunable Laser Spectrometer aboard NASA’s Curiosity rover since the August 2012 landing in Gale Crater find surface concentrations of the gaseous hydrocarbon much too low to support subsurface biological activity as a source. Yet the Martian methane saga is far from over, according to Christopher Webster, of NASA’s Jet Propulsion Laboratory, the TLS instrument lead and principal author of a study, Low Upper Limit to Methane ...


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