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Sand ripples in motion near Spirit Eight Hazcam images captured over a period of 17 days show how forcefully the winds are blowing across Spirit in Gusev Crater. In the first image, captured on sol 1250 / July 10, 2007, Spirit's left wheel has left a track in the sand. Over the subsequent sols, wind obliterates the track. NASA / JPL-Caltech / Fredk