NASA Mars Mission: No Little Green Men -- Yet
11/30/2012 NASA debunks rumors of new evidence of life on Mars, but its Curiosity rover continues to make many smaller discoveries. Some of NASA's latest images raise interesting questions.
Here's another outcrop, this one called Link, composed of small, rounded rocks that have been cemented together. According to NASA, water transport is the only process capable of producing the rounded shape of rocks of this size. Credit: NASA
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