NASA is sniffing out the sweet smell of methane on Earth, Mars and beyond. It's a greenhouse gas and, in some places, possibly a sign of ancient life.

NASA is sniffing out the sweet smell of methane on Earth, Mars and beyond. It's a greenhouse gas and, in some places, possibly a sign of ancient life.

NASA is sniffing out the sweet smell of methane on Earth, Mars and beyond.&nbsp;It's a greenhouse gas and, in some places, possibly a sign of ancient life.

ScienceCast 223: Methane Stinks? On Earth, Mars, and Beyond

NASA video series covering fun, interesting, and unusual science and research topics from the International Space Station and NASA’s science missions.

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ScienceCast 223: Methane Stinks? On Earth, Mars, and Beyond

ScienceCast 223: Methane Stinks? On Earth, Mars, and Beyond

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