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摘要

描述 The knobby terrain seen throughout the top inset is unlike any seen before on Jupiter's moons. The spires are very icy but also contain some darker dust. As the ice erodes, the dark material apparently slides down and collects in low-lying areas. Over time, as the surface continues to erode, the icy knobs will likely disappear, producing a scene similar to the bottom inset. The number of impact craters in the bottom image indicates that erosion has essentially ceased in the dark plains shown in that image, allowing impact craters to persist and accumulate.
来源 NASA Planetary Photojournal [1]
作者 NASA
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： PIA03455

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当前2007年12月17日 (一) 11:572007年12月17日 (一) 11:57版本的缩略图2,000 × 1,510（304 KB）Poppy((Information |Description=The knobby terrain seen throughout the top inset is unlike any seen before on Jupiter's moons. The spires are very icy but also contain some darker dust. As the ice erodes, the dark material apparently slides down and collects i

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