Since they landed on opposite sides of Mars in January 2004, the Mars rovers have been relaying valuable information back to Earth, despite their engineering warranty of 90 days of life on the Red Planet. On October 15th, NASA announced that it was extending their missions for a fifth time, perhaps through the year 2009. This unexpected longevity turned out to be highly beneficial to NASA researchers because , as Steve Squyres said, " Spirit didn't make its biggest discovery until 1,200 plus sols (a Martian day) into the mission."
http://www.space.com/scienceastronomy/071106-st-mars-rovers.html
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