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This magnified look at the martian soil near the Mars Exploration Rover Opportunity's landing site, Meridiani Planum, shows coarse grains sprinkled over a fine layer of sand, in this image released by NASA's Jet Propulsion Laboratory in Pasadena, California, February 4, 2004. The image was captured on the 10th day of the rover's mission by its microscopic imager and roughly approximates the color a human eye would see. Opportunity, NASA's second of two roving Mars probes, rolled ten feet off its lander onto Mars on January 31.

The surface of Mars

Close-up views of our neighboring planet.