NASAのインスタグラム(nasa) - 7月17日 06時40分

Acquired on April 1, this image from our Mars Reconnaissance Orbiter shows Aram Chaos, a 280 kilometer-diameter ancient impact crater that lies within in the Southern Highlands of Mars. The chiseled light-toned layers, composed largely of the iron-oxide hematite and water-altered silicates, indicate that this crater once held a lake. Yet another nod to the Red Planet’s rich geologic past.
Image Credit: NASA/JPL-Caltech/Univ. of Arizona

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