July 7, 2003, NASA's Opportunity Rover Launches to Mars
NASAJul 7, 2015, 6:17:34 PM
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 is still active.
Original: http://www.nasa.gov/image-feature/july-7-2003-nasas-opportunity-rover-launches-to-mars