NASA / JPL / CORNELL / USGS / SCIENCE PHOTO LIBRARY NASA / JPL / CORNELL / USGS / SCIENCE PHOTO LIBRARY
Martian soil. Micrograph of a patch of soil on Mars, showing spherical grains on a fine layer of sand. The spherical particles may have been formed by the cooling of molten rock, or by the accretion in water of successive layers around a smaller particle. This image was taken by the microscopic imager instrument on the Mars Exploration Rover Opportunity, near the rock outcrop called Stone Mountain. Opportunity reached Stone Mountain on 5 February 2004. This was the most detailed view of the soil to date. The image is a mosaic, formed from several separate images.
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