NASAのインスタグラム(nasa) - 8月14日 06時24分

Tall Boulder Rolls Down Martian Hill, Lands Upright: The track left by an oblong boulder as it tumbled down a slope on Mars runs from upper left to right center of this image. The boulder came to rest in an upright attitude at the downhill end of the track. The HiRISE camera on our Mars Reconnaissance Orbiter recorded this view on July 14, 2014.

Image Credit: NASA/JPL-Caltech/Univ. of Arizona

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