Washington University scientist Ray Arvidson said the spacecraft's thrusters may have blown away dirt covering the ice when the robot landed one week ago.

华盛顿大学科学家Ray Arvidson称着陆器的推进器也许将在一周前着陆时将覆盖在冰面的灰尘吹开。

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"I wouldn't be surprised as we move uphill that we find a section of the rock, in fact, that was modified in a shallow open-water environment, " said Ray Arvidson, rover deputy principal investigator and a geologist at Washington University in St.

CNN: Mars rovers working overtime