Engineers are deploying a lightweight version of a test rover (foreground) that will better simulate Mars's gravity, which is 38% that of Earth's (Image: NASA/JPL-Caltech)From New Scientist:
In the struggle to free the Mars rover Spirit from a sand trap, NASA engineers are bringing out the reserve troops. A second, lighter duplicate rover slid into a sandbox for testing this week, delaying any attempt to free Spirit by as much as three weeks, to mid-September.
Spirit has been stuck in a sandpit for nearly four months. Since late June, engineers have been trying to determine the best moves to extricate it by driving a test rover around a sandbox at NASA's Jet Propulsion Laboratory (JPL) in California.
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