Mars Exploration Rovers Spirit and Opportunity landed on Mars January 2004. They are still there and have explored Mars for 5 years.
PHOTOS: © Nasa
http://www.nasa.gov/mission_pages/mer/index.html
http://www.nasa.gov/mission_pages/mars/main/index.html
http://www.nasa.gov/externalflash/mer20090129/index.html
http://antwrp.gsfc.nasa.gov/apod/ap090110.html
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Posted on March 26, 2009
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