The two NASA Mars rovers, Spirit and Opportunity, are still at work on the Martian surface. The lengthy durations of their missions is all the more impressive because of the problems that have occurred that might theoretically have had dramatically negative effects on their functions. Spirit is losing power. Opportunity has lost two encoders. However, in spite of these potential setbacks, the rovers' missions continue.
Source:
http://www.cio.com.au/index.php/id;750137851
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