Beschreibung : 2 covers with illustrated Pasadena post stamps. Opportunity, also known as MER-B (Mars Exploration Rover – B) or MER-1, is a robotic rover.
MAR-1 ceased communications in 2010, while Opportunity (MAR-2) remains active as of 2015, having already exceeded its operating plan by 11 years, 145 days (in Earth time). Opportunity has continued to move, gather scientific observations, and report back to Earth for over 45 times its designed lifespan.

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

USA 2697 L