The twin Mars rovers, Opportunity and Spirit are still going strong after 45 months on Mars, 42 months past their initial mission lengths. To date, Spirit has traveled 4.51 miles and Opportunity has traveled 7.19 miles. Combined, the two rovers have returned nearly 200,000 images. While the continued success of the rovers depends on their continued operability and productivity, NASA expects that each rover will remain in service well into 2009.
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