Photo: Mars Scientists Intensify Search for Water

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"Blueberries" dot the Martian surface near Victoria Crater in this image taken by the NASA rover Opportunity on August 30, 2006. Measuring up to a fifth of an inch (five millimeter) wide, the spheres are believed to be rich in iron. Scientists speculate they formed in deposits permeated by water.

Image courtesy NASA/JPL-Caltech/Cornell/U.S. Geological Survey

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