NASAのインスタグラム(nasa) - 3月14日 08時30分

Imprints on the surface of Mars reveal a history of flowing water. In this Mars Reconnaissance Orbiter image, old stream channels, possibly more resistant to erosion because of their composition, now stand above fan-shaped deposits, each affirming the Red Planet's complex geologic past.
Image credit: NASA/JPL-Caltech/Univ. of Arizona

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