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File:Proctor Crater, Mars.jpg

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原始文件 (2,560 × 1,920像素,文件大小:718 KB,MIME类型:image/jpeg


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English: This view from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter is of the Proctor Crater. The relatively bright, small ridges are ripples. From their study on Earth, and close-up examination by the MER rovers (roving elsewhere on Mars), scientists surmise that the ripples are composed of fine sand (less than 200 microns in diameter) or fine sand coated with coarser sand and granules. The larger, darker bed-forms are dunes composed of sand, most likely of fine size. Ripples tend to move slower than dunes. Because of this, over time, ripples get covered with dust, possibly explaining the bright tone visible here. The dunes are dark probably because they are composed of basaltic sand (derived from dark, volcanic rock) that is blown by the wind enough that dust does not sufficiently accumulate to change their colour. This area in Proctor Crater is being monitored by HiRISE to document any changes over time.
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来源 NASA Image of the Day
作者 NASA/JPL-Caltech/University of Arizona

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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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当前2009年12月7日 (一) 15:522009年12月7日 (一) 15:52版本的缩略图2,560 × 1,920(718 KB)Originalwana{{Information |Description={{en|1=This view from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter is of the Proctor Crater. The relatively bright, small

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