APOD260209 重访米兰达

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重访米兰达

图像提供: NASA[1], JPL[2], Voyager 2[3]; Processing & License: Flickr: zelario12[4]; 文稿: Keighley Rockcliffe[5] (NASA[6], UMBC[7], CRESST II[8])

英文原文:Explanation: What is Miranda really like? Visually, old image s from NASA's Voyager 2 have been recently combined and remastered to result in the featured image of Uranus 's 500-kilometer-wide moon. In the late 1980s, Voyager 2 spacecraft flew by Uranus , coming close to the cratered, fractured, and unusually grooved moon -- named after a character from Shakespeare ’s The Tempest . Scientifically, planetary scientists are using old data and clear images to theorize anew about what shaped Miranda's severe surface features. A leading conclusion is that Miranda may have once hosted an expansive liquid water ocean beneath its icy surface -- which may be slowly freezing. Thanks to the legacy of Voyager 2, Miranda has joined the ranks of Europa , Titan , and other icy moons in the search for water, and, possibly, microbial life , in our Solar System . Jigsaw Moon: Astronomy Puzzle of the Day 说明：米兰达(天卫五)究竟是什么样子？从视觉上来看，NASA航海家2号太空船拍摄的旧图像[9]最近被重新组合和处理，最终呈现出这张天王星[10]卫星米兰达的主题图像[11]。这颗卫星直径约500公里。在1980年代末，航海家2号[12]太空船飞掠天王星[13]，近距离观察了这颗表面布满陨石坑、裂缝纵横、沟壑交错[14]的卫星——它的名字来自莎士比亚[15]戏剧《暴风雨》[16]中的一个角色[17]。从科学的角度来看，行星科学家正在利用旧数据和清晰图像重新理论化[18]米兰达表面严酷地貌的成因。一项主要结论[19]是米兰达[20]冰冷的表面下可能曾经存在一片广阔的液态水海洋——如今这片海洋可能正在缓慢冻结。这样的海洋可能源于过去的潮汐加热与内部活动，并曾在一定程度上重塑其表面。得益于航海家2号的长久影响，米兰达[21]加入了欧罗巴(木卫二)[22]、泰坦(土卫六)[23]和其他冰卫星的行列，成为在我们的太阳系[24]中寻找水，甚至可能的微生物生命[25]的探索[26]对象。