NASA's Viking project found a place in history when in 1976 it became the first U.S. mission to land spacecraft successfully on the surface of Mars. The life-detection landers may have measured ... more 
NASA's Viking project found a place in history when in 1976 it became the first U.S. mission to land spacecraft successfully on the surface of Mars. The life-detection landers may have measured signatures of perchlorates, in the form of chlorin less 
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SPACE.com | Photo By NASA/JPL-Caltech/University of Arizona
Thu, Jun 13, 2013 4:30 PM EDT