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Amazing pictures from 20 years of robots on Mars (5)

(Chinanews.com)    09:49, July 05, 2017
Amazing pictures from 20 years of robots on Mars
Russell Crater dunes are a favorite target for HiRISE images not only because of their incredible beauty, but for how we can measure the accumulation of frost year after year in the fall, and its disappearance in the spring.(Photo/NASA)

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