The Mars rover "Spirit" needs to find relocate to a sunny slope to survive the martian winter. The rover needs to get a on a slope 20-25 degrees so it can aim its solar panels at the sun. The rovers mission to the slope is being made difficult as one of it's six wheels has been disabled and it needs to travel in reverse while dragging the immobilized wheel. Although the martian winter isn't expected to start until April 2008, the rover team wants to get the rover into position by January so that they don't have to worry about difficulties getting to the slope.
http://blog.wired.com/wiredscience/2007/11/mars-rover-spir.html
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