Curiosity detects unusually high methane levels
This week, NASA's Curiosity Mars rover found a surprising result: the largest amount of methane ever measured during the mission - about 21 parts per billion units by volume (ppbv). One ppbv means that if you take a volume of air on Mars, one billionth of the volume of air is methane. The finding came from the rover's Sample Analysis at Mars (SAM) tunable laser spectrometer. It's exciting