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This image is an artist's concept of a view looking down on NASA's Mars Reconnaissance Orbiter. The spacecraft is pictured using its Shallow Subsurface Radar instrument (SHARAD) to "look" under the surface of Mars. The radar instrument will seek liquid or frozen water within the first few hundred feet (up to a kilometer) under the martian surface.
source: http://photojournal.jpl.nasa.gov/catalog/PIA07244
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