The Mars Exploration Rover mission successfully landed and operated the rovers Spirit and Opportunity on the planet Mars from 2004 to 2018. During Spirit's six years of operation and Opportunity's fourteen years of operation, the rovers drove a total of 52 kilometres (32 miles) on the Martian surface, visiting various surface features in their landing sites of Gusev crater and Meridiani Planum, respectively.[1][2][3][4]
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