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When the twin rovers Spirit and Opportunity touched down on Mars in January 
2004, they were expected to drive a few hundred yards and last 90 days. But 
scientists were wrong; the hardy robots proved to be two of the greatest 
explorers of the Space Age. Now, 10 years later, one rover is down, but the 
other refuses to die and continues to send back stunning images and exciting 
new scientific information. As newer rovers continue to land on the alien 
planet, we look back at this remarkable journey.