Eight years ago, the second Mars Exploration Rover mission (Oppportunity (MER-2) landed on the surface of Mars in the Meridiani Planum, near the equator of Mars, three weeks after the landing of its twin, Spirit (MER-1), on the opposite side of Mars. Designed for a primary mission life of 90 sols (Mars days, each approximately 27 hours 37 Earth days), Opportunity is still functioning eight years later.
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Karl L. Swartz.
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