Three generations of Mars rovers, Three enormous leaps in wheel size.
Left: A replica wheel from Sojourner, the first Mars rover deployed as a part of the Mars Pathfinder mission in 1997.
Center: We see an increase in wheel size from twin rovers Spirit and Opportunity, the centrepieces of the Mars Exploration Rover mission.
Right: Mars Science Laboratory rover Curiosity raises the stakes with wheels that make Sojourner’s wheels look like training wheels!
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