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 of NASA’s Mars Exploration Rover Mission, touched down on the other side of the planet.
While Spirit became immobile in 2009 and ceased communications in 2010, Opportunity remains active as of 2014, having already exceeded its planned 90 sol (Martian days) duration of activity by 10 years, 62 days (in Earth time). Opportunity has continued to move, gather scientific observations, and report back to Earth. What follows is a summary of events during its continuing mission.