土星的土卫二
(原标题: Enceladus by Saturnshine)
2023-02-05
浏览次数: 14
这个月亮被它的行星的光照耀着。具体来说，图中土卫二的很大一部分主要是由土星反射的阳光照亮的。结果是，通常雪白的月亮出现在土星云顶的金色中。由于大部分光线来自图像的左侧，迷宫般的山脊在图像中心的右侧投下了明显的阴影，而千米深的Labtayt Sulci峡谷就在下方可见。最右边的明亮的细新月是土卫二上唯一被太阳直接照亮的部分。这张特色图片是卡西尼号宇宙飞船在2011年近距离飞过这颗神秘的卫星时拍摄的。仔细观察这张数码锐化图像的左下方，可以发现被认为是源自海底的冰晶羽状物。
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This moon is shining by the light of its planet. Specifically, a large portion of Enceladus pictured here is illuminated primarily by sunlight first reflected from the planet Saturn. The result is that the normally snow-white moon appears in the gold color of Saturn's cloud tops. As most of the illumination comes from the image left, a labyrinth of ridges throws notable shadows just to the right of the image center, while the kilometer-deep canyon Labtayt Sulci is visible just below. The bright thin crescent on the far right is the only part of Enceladus directly lit by the Sun. The featured image was taken in 2011 by the robotic Cassini spacecraft during a close pass by the enigmatic moon. Inspection of the lower left part of this digitally sharpened image reveals plumes of ice crystals thought to originate in a below-surface sea.