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PIA05482_modest.jpg (447 × 333像素,文件大小:21 KB,MIME类型:image/jpeg


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English: This image taken by the Mars Exploration Rover Opportunity's panoramic camera shows the rock nicknamed "Last Chance," which lies within the outcrop near the rover's landing site at Meridiani Planum, Mars. The image provides evidence for a geologic feature known as ripple cross-stratification. At the base of the rock, layers can be seen dipping downward to the right. The bedding that contains these dipping layers is only one to two centimeters (0.4 to 0.8 inches) thick. In the upper right corner of the rock, layers also dip to the right, but exhibit a weak "concave-up" geometry. These two features -- the thin, cross-stratified bedding combined with the possible concave geometry -- suggest small ripples with sinuous crest lines. Although wind can produce ripples, they rarely have sinuous crest lines and never form steep, dipping layers at this small scale. The most probable explanation for these ripples is that they were formed in the presence of moving water.
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来源 http://photojournal.jpl.nasa.gov/catalog/pia05482
作者 NASA/JPL/Cornell
本图像或视频收录于美国国家航空航天局 (NASA)喷气推进实验室(Jet Propulsion Laboratory),其照片编号是: PIA05482

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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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  • 2004-03-02 23:37 Perl 447×333× (21804 bytes) This image taken by the Mars Exploration Rover Opportunity's panoramic camera shows the rock nicknamed "Last Chance," which lies within the outcrop near the rover's landing site at Meridiani Planum, Mars. The image provides evidence for a geologic feature

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当前2009年5月28日 (四) 22:502009年5月28日 (四) 22:50版本的缩略图447 × 333(21 KB)File Upload Bot (Magnus Manske) {{BotMoveToCommons|en.wikipedia|year={{subst:CURRENTYEAR}}|month={{subst:CURRENTMONTHNAME}}|day={{subst:CURRENTDAY}}}} {{Information |Description={{en|This image taken by the Mars Exploration Rover Opportunity's panoramic camera shows the rock nicknamed

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