Opportunity and its twin Spirit landed on Mars in march 2004 , and mission was supposed to continue for six - months . Last year , Opportunity broke ground for off - orbit spacecraft traveled aboard Soviet Union 's explorer 2 moon rover .
Opportunity and its twin Spirit landed on Mars in January 2004 , and mission was supposed to last for three-months . Last year , Opportunity broke record for off-Earth distance traveled beating Soviet Union 's Lunokhod 2 moon rover .