环冰巨海王星
(原标题: Ringed Ice Giant Neptune)
2024-09-06
浏览次数: 22
这幅由詹姆斯·韦伯太空望远镜拍摄的近红外图像显示，环状冰巨海王星位于图像中心附近。这颗昏暗而遥远的行星是离太阳最远的行星，距离大约是地球的30倍。但在韦伯令人惊叹的视野中，这颗行星的黑暗和幽灵般的外观是由于大气中的甲烷吸收了红外光。然而，到达海王星大部分吸收甲烷的高空云很容易在图像中脱颖而出。海王星最大的卫星海卫一被冰冻的氮包裹着，在反射的阳光中比海王星更亮，在左上角可以看到韦伯望远镜特有的衍射峰。包括海卫一在内，海王星的14颗已知卫星中有7颗可以在视野中识别出来。在这张基于太空的行星肖像中，海王星微弱的光环引人注目。这是自1989年8月旅行者2号宇宙飞船造访海王星以来，人们首次看到这个复杂的环系统的细节。
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Ringed ice giant Neptune lies near the center of this sharp near-infrared image from the James Webb Space Telescope. The dim and distant world is the farthest planet from the Sun, about 30 times farther away than planet Earth. But in the stunning Webb view, the planet's dark and ghostly appearance is due to atmospheric methane that absorbs infrared light. High altitude clouds that reach above most of Neptune's absorbing methane easily stand out in the image though. Coated with frozen nitrogen, Neptune's largest moon Triton is brighter than Neptune in reflected sunlight, seen at the upper left sporting the Webb telescope's characteristic diffraction spikes. Including Triton, seven of Neptune's 14 known moons can be identified in the field of view. Neptune's faint rings are striking in this space-based planetary portrait. Details of the complex ring system are seen here for the first time since Neptune was visited by the Voyager 2 spacecraft in August 1989.