Spirit Rover Examining Soil on Mars

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An Artist's Depiction of Spirit on Mars

Artist's depiction of Spirit on Mars NASA/JPL hide caption

itoggle caption NASA/JPL

The NASA rover Spirit extends its robotic arm to further explore the surface of Mars, seeking physical evidence that water once flowed over the planet's surface.

A careful analysis of the soil near Spirit's landing site may provide that evidence. So far the mission is a success for NASA's engineers. Now the science team is awaiting big results. NPR's Joe Palca reports.

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