環冰巨人海王星
Ringed Ice Giant Neptune
發表日期:2024-09-06
環狀冰巨行星海王星位於詹姆斯-韋伯太空望遠鏡拍攝的這張清晰的近紅外影像的中心附近。這個暗淡而遙遠的世界是距離太陽最遠的行星,大約是地球的 30 倍。但是,在韋伯望遠鏡令人驚歎的畫面中,這顆行星幽暗的外表是由於大氣中的甲烷吸收了紅外線。不過,海王星大部分吸收甲烷的高空雲層很容易在影像中脫穎而出。海王星最大的衛星海衛一被冰凍的氮氣包裹,在反射的陽光下比海王星更亮,在左上方可以看到韋伯望遠鏡特有的衍射尖峰。包括海衛一在內,海王星 14 顆已知衛星中的 7 顆都可以在視場中找到。在這幅天基行星肖像中,海王星的微弱星環非常引人注目。自 1989 年 8 月航海家 2 號宇宙飛船造訪海王星以來,人們第一次在這裡看到了複雜星環系統的細節。
原文: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.
※ 本文由萌芽機器人自動轉貼自每日一天文圖(Astronomy Picture of the Day,APOD),原文為英文,正體中文是透過 DeepL 翻譯及 OpenCC 進行自動處理,內容僅供參考,若有任何錯誤之處還請見諒!
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