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Opportunity, MER-B (Mars Exploration Rover – B), is a robotic rover on the planet Mars, active since 2004. Launched from Earth on July 7, 2003, it landed on Meridiani Planum on January 25, 2004 at 05:05 Ground UTC (about 13:15 local time). This was 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. Its twin became immobile in 2009 and in 2010 ceased communications, but MER-B is still active as of 2012, having already exceeded its planned duration of activity thirty times over.