真實色彩的土衛二
Enceladus in True Color

發表日期:2025-06-10
土星衛星恩克拉多斯(Enceladus)冰層下的海洋是否含有生命? 有理由這麼認為,這涉及到一個長長的特徵--有些被稱為虎紋--已知這些特徵將冰從月球冰冷的內部噴向太空。這些表面裂縫在月球南極上空形成了細小的冰粒雲,並形成了土星神秘的E 環。 2004 年至 2017 年期間,機器人卡西尼號宇宙飛船圍繞土星執行,為這一現象提供了證據。 圖為近距離飛掠時拍攝的土衛二高解析度真彩圖像。 深層裂縫有部分陰影。 土衛二為何活躍仍是一個謎,因為鄰近的衛星米馬斯(Mimas)大小與土衛二相仿,卻顯得死氣沉沉。對噴出的冰粒進行分析後發現了複雜有機分子的證據。這些富含碳的大分子支援--但不能證明--土衛二表面下的海洋可能含有生命。 APOD 30 歲了!:明天(週三)下午 7 點在安克雷奇舉辦免費公開講座
原文:Do oceans under the ice of Saturn's moon Enceladus contain life? A reason to think so involves long features -- some dubbed tiger stripes -- that are known to be spewing ice from the moon's icy interior into space. These surface cracks create clouds of fine ice particles over the moon's South Pole and create Saturn's mysterious E-ring. Evidence for this has come from the robot Cassini spacecraft that orbited Saturn from 2004 to 2017. Pictured here, a high resolution image of Enceladus is shown in true color from a close flyby. The deep crevasses are partly shadowed. Why Enceladus is active remains a mystery, as the neighboring moon Mimas, approximately the same size, appears quite dead. A analysis of ejected ice grains has yielded evidence that complex organic molecules. These large carbon-rich molecules bolster -- but do not prove -- that oceans under Enceladus' surface could contain life. APOD Turns 30!: Free public lecture in Anchorage tomorrow (Wednesday) at 7 pm
※ 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。