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Which rover was the first to explore Mars?

Curiosity

Opportunity

Sojourner

Spirit

Sojourner was the first Mars rover. It was much smaller than Curiosity, whose wheel is about the size of the whole Sojourner. It landed on July 4, 1997 as part of the Mars Pathfinder mission on Mars's Ares Vallis and remained in contact with Earth till September 27, 1997.

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3

Chris Radcliff wikipedia → Mars rover

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