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English: Opportunity, MER-B (Mars Exploration Rover – B), is a robotic rover on the planet Mars, active since 2004. It is the remaining rover in NASA's ongoing Mars Exploration Rover Mission. Launched from Earth on 7 July 2003, it landed on the Martian Meridiani Planum on 25 January 2004 at 05:05 Ground UTC (about 13:15 local time), three weeks after its twin Spirit (MER-A) touched down on the other side of the planet.
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