Both of NASA's Mars rover continue to stay in great working operation after more than three and a half years of exploring the martian surface. NASA is extending for the fifth time the activities of these two robots. This is incredible due to the engineering warranty life expectancy of 90 days! This is very good news for NASA because the longer the life of these robots, the more NASA can find out about Mars. For example Spirit didn't actually make its biggest discovery until 1200 Martian days into the mission.
Link: http://www.space.com/scienceastronomy/071106-st-mars-rovers.html
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