File:Conical mound in trough on Mars' north pole.jpg
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本预览的尺寸:800 × 548像素。 其他分辨率:320 × 219像素 | 640 × 438像素 | 1,024 × 702像素 | 1,280 × 877像素 | 1,734 × 1,188像素。
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[编辑]描述Conical mound in trough on Mars' north pole.jpg |
English: This striking image of a mound within the area of a trough cutting into Mars' north polar layered deposits was taken by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter on September 2, 2008.
The north polar layered deposits are a stack of discernible layers that are rich in water-ice. The stack is up to several miles thick. Each layer is thought to contain information about the climate that existed when it was deposited. If true, the stack could represent a record of how climate has varied on Mars in the recent past. The internal layers are exposed in troughs and scarps where erosion has cut into the stack. The trough shown in this image contains a 1,640-foot thick section of the layering. A conical mound partway down the slope stands approximately 130 feet high. One possible explanation for this unusual mound is that it may be the remnant of a buried impact crater now being exhumed. As the north polar layered deposits accumulated, impacts occurred throughout their surface area, then the impact craters were buried by additional ice. These buried craters are generally inaccessible, but, in a few locations, erosion that forms a trough (like this one) can uncover these buried structures. For reasons poorly understood, the ice beneath the site of the crater is more resistant to this erosion, so when material is removed by erosion the ice beneath the old impact site remains, forming this isolated hill. |
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来源 | NASA website; description,[1] high resolution image.[2] |
作者 | NASA/JPL-Caltech/University of Arizona |
这是一张修改过的图片,这意味着它已在原版本的基础上通过软件进行了编辑,改动内容:Rotated source image。
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[编辑]Public domainPublic domainfalsefalse |
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当前 | 2008年10月28日 (二) 11:31 | 1,734 × 1,188(1.23 MB) | Elipongo(留言 | 贡献) | {{Information |Description={{en|1=This striking image of a mound within the area of a trough cutting into Mars' north polar layered deposits was taken by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's [[Mars Reconnaissance Or |
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