Microbes may once have happily existed on the surface of Mars, according to chemical analysis of a sedimentary rock in the Red Planet's Gale crater. NASA geologist and exobiologist David Blake discusses evidence for an ancient freshwater lake in the crater, and describes the mineral-chomping microbes that may have thrived there.
Source: http://www.npr.org/2013/03/15/174409390/curiosity-hits-paydirt-new-clues-to-life-on-mars?ft=1&f=1007
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