File:ESP 031221 1315-Mars-CopernicusCrater-OlivineDuneTerrain-20190831.jpg

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English: Raindrops of Sand in Copernicus Crater

https://www.uahirise.org/hipod/ESP_031221_1315

https://www.sciencealert.com/these-images-showcase-mars-at-its-most-gloriously-alien

The dark features here look like raindrops, but are actually sand dunes. This spot was targeted by CRISM because the dunes are rich in the mineral olivine.

Olivine-rich dunes are very rare on Earth, as olivine rapidly weathers to clays in a wet environment. There is also olivine-rich bedrock in the central peaks of Copernicus Crater on the Moon.

There is only a handful of very important scientists, like Nicolaus Copernicus (1473-1543) who have craters named after them on both Mars and the Moon.
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来源 https://static.uahirise.org/hipod/ESP_031221_1315.jpg
作者 NASA/JPL/UArizona

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Public domain 本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zhNASA版权方针页面JPL图片使用方针。)
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Mars - Copernicus Crater - Olivine Dune Terrain - August 31, 2019

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