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John Johnson
For Mars rover Spirit, it's do or die
For Mars rover Spirit, it's do or die

NASA scientists said Thursday that they had come up with a plan to free the stalled rover Spirit from its Martian sand trap but also warned that the plan might not work. If it doesn't, the popular robot could finally reach its end. Rover managers will send the first in a new set of computer commands on Monday in an effort to maneuver Spirit out of the fluffy, loose soil where it's been stuck for the last six months. In a teleconference briefing for reporters, the Mars rover team said it was "optimistic" that Spirit would be able to resume its peregrinations across the Martian surface. But in admitting that this is by far the most serious threat Spirit and its twin,...

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