穿越土星環平面
Crossing Saturn's Ring Plane
發表日期：2025-11-16
如果這是土星，那麼土星環在哪裡？ 1612 年，當土星的 "附屬物 "消失時，伽利略不明白為什麼。 在那個世紀的後期，人們逐漸明白土星的異常突起是星環，當地球穿過星環平面時，邊緣上的星環就會消失。 這是因為土星環被限制在一個比刀片薄許多倍的平面內。 在現代，圍繞土星執行的機器人 "卡西尼 "號宇宙飛船在 2004 年至 2017 年執行土星任務期間，經常穿越土星環平面。 感興趣的西班牙業餘愛好者費爾南多-加西亞-納瓦羅（Fernando Garcia Navarro）從網上龐大的卡西尼原始影像檔案中挖掘出了一組 2005 年 2 月的平面交叉影像。 這裡展示的是經過數字裁剪並設定了代表性色彩的驚人結果。 土星的細環平面顯示為藍色，土星上層大氣中的雲帶和雲層顯示為金色。土星環的細節可以從高處的暗影中看到。 衛星 Dione 和 Enceladus 在土星環中顯示為凸起。
原文：If this is Saturn, where are the rings? When Saturn's "appendages" disappeared in 1612, Galileo did not understand why. Later that century, it became understood that Saturn's unusual protrusions were rings and that when the Earth crosses the ring plane, the edge-on rings will appear to disappear. This is because Saturn's rings are confined to a plane many times thinner, in proportion, than a razor blade. In modern times, the robotic Cassini spacecraft that orbited Saturn frequently crossed Saturn's ring plane during its mission to Saturn, from 2004 to 2017. A series of plane crossing images from 2005 February was dug out of the vast online Cassini raw image archive by interested Spanish amateur Fernando Garcia Navarro. Pictured here, digitally cropped and set in representative colors, is the striking result. Saturn's thin ring plane appears in blue, bands and clouds in Saturn's upper atmosphere appear in gold. Details of Saturn's rings can be seen in high dark shadows. The moons Dione and Enceladus appear as bumps in the rings.
※ 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！
關於每日一天文圖：每日一天文圖網站是美國國家航空暨太空總署與密西根理工大學提供的服務，網站每天提供一張影像或圖片，並由天文學家撰寫扼要說明其特別之處。