A piece of Gale crater, Mars: Cream-colored ripples wind their way through rough terrain. Looking more closely, the rocky surface seems to be made of highly eroded parallel ridges that are nearly perpendicular to most of the ripples. These ridges might be a remnant of much older (and larger) wind-blown ripples. When Curiosity drives over a surface like this one, we will be able to do more than just speculate about it. (HiRISE ESP_024102_1755)

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