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The mars exploration missions launched in 2003, successfully landing two rovers, spirit and opportunity on the red planet.
The mission's objective was to search for clues to past water activity on Mars. The mission also included three previous landers: the two Viking program landers in 1976 and Mars Pathfinder probe in 1997.
Both rovers were given an expected lifespan of just 90 days due to the notorious dust storms present on the surface. 14 years later..they are still going because something is cleaning the solar panels.
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