Eight Earth years ago today NASA's Spirit rover landed on Mars. Seventeen days later, on the other side of the Red Planet, Opportunity bounced to a stop.
Those two events marked the beginning of a remarkable exploration. Slated for 90 day missions, both rovers far exceeded that. Spirit only gave out last year, and Opportunity is still rolling along. Together, they have helped scientists build a new understanding of Mars, making a strong case that water once flowed on the surface of the planet.
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