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Home This illustration portrays possible ways methane might be added to Mars’ atmosphere (sources) and removed from the atmosphere (sinks). (NASA/JPL-Caltech/SAM-GSFC/Univ. of Michigan) This illustration portrays possible ways methane might be added to Mars' atmosphere (sources) and removed from the atmosphere (sinks). (NASA/JPL-Caltech/SAM-GSFC/Univ. of Michigan)

This illustration portrays possible ways methane might be added to Mars’ atmosphere (sources) and removed from the atmosphere (sinks). (NASA/JPL-Caltech/SAM-GSFC/Univ. of Michigan)

This illustration portrays possible ways methane might be added to Mars' atmosphere (sources) and removed from the atmosphere (sinks). (NASA/JPL-Caltech/SAM-GSFC/Univ. of Michigan)

This illustration portrays possible ways methane might be added to Mars’ atmosphere (sources) and removed from the atmosphere (sinks). (NASA/JPL-Caltech/SAM-GSFC/Univ. of Michigan)

The first definitive detection of Martian organic chemicals in material on the surface of Mars came from analysis by NASA’s Curiosity Mars rover of sample powder from this mudstone target, “Cumberland.” (NASA/JPL-Caltech/MSSS)