Descripción : Opportunity, also known as MER-B (Mars Exploration Rover – B) or MER-1, is a robotic rover active on the planet Mars since 2004. Launched on July 7, 2003 as part of NASA`s Mars Exploration Rover program, it landed in Meridiani Planum on January 25, 2004, three weeks after its twin Spirit (MER-A) touched down on the other side of the planet.
Opportunity remains active as of 2015, having already exceeded its operating plan by 11 years, 148 days (in Earth time). Opportunity has continued to move, gather scientific observations, and report back to Earth for over 45 times its designed lifespan.
Pasadena illustrated post stamp.

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OPPORTUNITY (MER-1, MER-B) (MARS EXPLORATION ROVER) · DELTA 7925H-9.5