丘留莫夫-格拉西门科彗星上一公里高的悬崖
(原标题: A Kilometer High Cliff on Comet Churyumov - Gerasimenko)
2024-12-16
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这一千米高的悬崖出现在彗星的表面。它是在楚留莫夫-格拉西门科彗星（CG）的暗核上被罗塞塔发现的，罗塞塔是欧洲航天局发射的一艘机器人航天器，从2014年到2016年绕彗星运行。这是罗塞塔号在任务初期拍摄到的锯齿状悬崖。虽然彗星CG高约一公里，但它表面的重力很低，人类从悬崖上跳下去是可以存活下来的。在悬崖脚下是相对平坦的地形，点缀着直径20米的巨石。来自罗塞塔的数据表明，彗星CG上的冰的氘含量明显不同，因此可能与地球海洋中的水有不同的来源。该探测器以罗塞塔石碑命名，这块石板上用三种不同的语言写着同样的文字，帮助人类破译古埃及文字。
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This kilometer high cliff occurs on the surface of a comet. It was discovered on the dark nucleus of Comet Churyumov - Gerasimenko (CG) by Rosetta, a robotic spacecraft launched by ESA, which orbited the comet from 2014 to 2016. The ragged cliff, as featured here, was imaged by Rosetta early in its mission. Although towering about one kilometer high, the low surface gravity of Comet CG would likely make a jump from the cliffs by a human survivable. At the foot of the cliffs is relatively smooth terrain dotted with boulders as large as 20 meters across. Data from Rosetta indicates that the ice in Comet CG has a significantly different deuterium fraction -- and hence likely a different origin -- than the water in Earth's oceans. The probe was named after the Rosetta Stone, a rock slab featuring the same text written in three different languages that helped humanity decipher ancient Egyptian writing.