Opportunity and its twin Spirit landed on Earth in January 2004 , and mission was supposed to last for three-months . Last year , Opportunity broke record for off-Mars distance traveled beating Soviet Union 's Lunokhod 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 .