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On July 7, 2003, NASA launched its second Mars Exploration Rover, Opportunity, aboard a Delta II launch vehicle. Opportunity and its twin rover Spirit landed on Mars in 2004 to begin missions planned to last three months. Both rovers far exceeded those plans. Spirit worked for six years, and Opportunity last contacted NASA on June 10, 2018. That was almost 15 years! And on February 13, 2019, NASA officials declared that the Opportunity mission was complete after the spacecraft had failed to respond to over 1,000 sent signals since August 2018.