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tsr zarrella mars rover laser _00010607
tsr zarrella mars rover laser _00010607

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    NASA's 'target practice' on Mars

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NASA's 'target practice' on Mars

CNN's John Zarrella explains how the Mars Rover will use a laser to identify chemical elements on Mars.

NASA's 'target practice' on Mars

CNN's John Zarrella explains how the Mars Rover will use a laser to identify chemical elements on Mars.