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There have been four rovers to successfully land and function on Mars, plus a number of probes and orbiters. The first of these rovers was Sojurner, which launched on December 4, 1996 and landed on Mars on July 5, 1997. After that were the twin rovers Spirit and Opportunity, which were launched June 10, 2003 and July 7, 2003, respectively. They landed on January 4 and 25 of 2004, respectively. Finally, the rover Curiositylaunched on November 26, 2011 and landed on August 6, 2012. Only Opportunity and Curiosity are still functional and mobile.

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9y ago

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