NASA’s top science mission planner, Associate Administrator John Grunsfeld, says NASA has the spare parts, plans and knowledge to create another Mars rover for launch in 2020. The mission, with a cost estimated by the Aerospace Corp. of $2.5 billion, needs congressional approval in what Grunsfeld acknowledges are “very tough fiscal times.” But he told members of the American Geophysical Union here Dec. 4 that the proposed mission “really reflects a strong commitment by NASA and the ...

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