Evidence of life on Mars? NASA rover finds methane, organic chemicals By Reuters - Wednesday, December 17, 2014 08:36 Share this NASA's Mars Curiosity rover finds methane in the Martian atmosphere and organic chemicals in the planet's soil, the latest hint that Mars was once suitable for microbial life. TAG :NASA, Mars Curiosity, methane, Martian atmosphere, organic chemicals, planet, soil, microbial life