Hi Leinad & All,
Here are two links to the findings:
http://www.skyandtelescope.com/news/home/37667714.html
http://www.spaceref.com:80/news/viewpr.html?pid=27373
Certainly interesting but no reason to leap to any wild conclusions -- but it is strange. It seems the methane in the atmosphere is being replenished. Sunlight will destroy methane over time so it appears there is a source that is re-gassing the atmosphere. Where does it come from?
No definitive evidence either way. Could be geological, could be biological, could come from a cometary impact -- at this stage it's anyone's guess.
Best,
Les D