John Ortiz has sniffed out methane. After, I am sure, quite a bit of gags (and jokes) from his team; they'd figured it came from the Curiosity rover.
This CH4 constitutes atmospheric pressure fluctuations that pull gases up from underground
. (Yeah, that's what I'll start having to call it too.) It fluctuates daily and seasonally, in this near-airless world's harsh temperature fluctuations. Boyle's Law, and such.
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