In 2004, Europe’s Mars Express mission detected small traces of methane in the Martian atmosphere, a sign that life may have existed on the red planet as recently as a few million years ago—and may still be there today.  More recently, NASA’s Curiosity rover discovered a spike in methane in the planet’s atmosphere, along with other organic molecules in a rock-powder sample collected by the robotic laboratory’s drill.  To follow up on these findings, ...

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