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Roving on the Red Planet

Robots tell a tale of once-wet Mars

By
9:26am, May 24, 2005

When Phil Christensen was 13, his family moved from the flatlands of Kansas to the foothills of southern California. He soon began backpacking in the Sierra Nevada and Joshua Tree Park, marveling at the rocky desert landscape. Thirty years later, Christensen is exploring similar terrain on another planet.

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