Transcripts for KPIX CBS Evening News With Scott Pelley 2012

>> pelley: for weeks now, word has been that nasa will be making a big announcement about its new mars rover. kurs's mission is to look for signs that the red planet could have supported life, and today we got another clue. here's john blackstone. >> reporter: the pictures of martian rocks, ridges, and sand drifts are among 11,000 images, including this self-portrait that the rover "curiosity" has sent back to earth in just four months. but what fueled rumors of a big discovery was the collection of a few scoops of martian soil. "curiosity" "curiosity's" on board chemical lab found a trace of carbon, an essential building block of life. "curiosity" lead scientist john grot singer. >> okay, it's on mars but maybe it didn't come from mars.

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