By Azadeh Ansari
CNN(CNN) -- Scientists have discovered methane in Mars' atmosphere, raising the possibility that life might exist on the planet.
The methane could have come from past or present subsurface microorganisms, geological activity or comets striking the planet, scientists and NASA officials said. Scientists were not sure how long the methane has been on the planet.
Methane -- four atoms of hydrogen bound to a carbon atom -- is the main component of natural gas on Earth. It's of interest to astrobiologists because organisms release much of Earth's methane as they digest nutrients. Other purely geological processes, like oxidation of iron, also release methane.
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NASA discovery of methane on Mars could mean life exists
Posted 15 January 2009 - 07:10 PM
So the combination is 1-2-3-4-5. That's the stupidest combination I've ever heard in my life! That's the kind of thing an idiot would have on his luggage!- Dark Helmet; "Live free or die. Death is not the worst of evils." - Gen. John Stark; "Half the world is composed of people who have something to say and can't, and the other half who have nothing to say and keep on saying it." -Robert Frost; "It does not require a majority to prevail, but rather an irate, tireless minority keen to set brush fires in people's minds." - Samuel Adams, Brewer/Patriot
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