NGC 4651 :傘星系
NGC 4651: The Umbrella Galaxy

發表日期:2025-06-30
下星星雨了 現在我們知道,這把看似巨大的宇宙雨傘其實是從一個小型衛星星系中剝離出來的恆星潮汐流。主星系是螺旋星系NGC 4651 ,大小與我們的銀河系差不多,而它的恆星傘似乎在這個星系明亮的圓盤上方延伸了大約 10 萬光年。當它以偏心軌道來回掠過 NGC 4651 時,一個小星系很可能被反覆碰撞撕裂了。在接下來的幾百萬年裡,剩餘的恆星肯定會回落,成為一個更大星系的一部分。這張特寫的深度影像是在沙烏地阿拉伯透過長時間曝光拍攝到的。傘星系位於大約 5000 萬光年遠的地方,朝向梳理整齊的北側 Berenice's Hair 星座(后髮座)。 現代格式的 APOD StellarSnap
原文:It's raining stars. What appears to be a giant cosmic umbrella is now known to be a tidal stream of stars stripped from a small satellite galaxy. The main galaxy, spiral galaxy NGC 4651, is about the size of our Milky Way, while its stellar parasol appears to extend some 100 thousand light-years above this galaxy's bright disk. A small galaxy was likely torn apart by repeated encounters as it swept back and forth on eccentric orbits through NGC 4651. The remaining stars will surely fall back and become part of a combined larger galaxy over the next few million years. The featured deep image was captured in long exposures from Saudi Arabia. The Umbrella Galaxy lies about 50 million light-years distant toward the well-groomed northern constellation of Berenice's Hair (Coma Berenices). APOD in a Modern Format StellarSnap
※ 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。