Opportunity mission timeline MER-B (Mars Exploration Rover – B), is a robotic rover active on the planet Mars since 2004. It was launched on July 7, 2003, Opportunity landed on Mars’ Meridiani Planum on January 25, 2004 at 05:05 Ground UTC (about 13:15 Mars local time), three weeks after its twin Spirit (MER-A), also part […]