Spirit has met many challenges over 5 years on Mars, from solar panels caked with dust to a broken right front wheel. Now she faces one of her toughest challenges yet, a ‘sand trap’ filled with soft, loose sand laced with rocks. JPL engineers are working around the clock to free her by sending commands to the test rover, deliberately stuck in the sand of the JPL testing facility.
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http://www.jpl.nasa.gov/freespirit/