Mars rover mission

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Caltech geologist John Grotzinger, the Curiosity mission's head scientist, examines the drill on a mock-up of the rover's equipment.

A geologist's expertise

( Patrick T. Fallon / Los Angeles Times / June 22, 2012 )

Caltech geologist John Grotzinger, the Curiosity mission's head scientist, examines the drill on a mock-up of the rover's equipment.

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