梅西耶 2 號
Messier 2

發表日期:2026-05-23
繼蟹狀星雲之後,這個巨大的星團是 18 世紀天文學家查爾斯·梅西耶在著名的“非彗星天體名錄”中列出的第二個天體。M 2 是已知在銀河系暈中游蕩的最大球狀星團之一。 儘管梅西耶最初將其描述為一個沒有恆星的星雲,但這張由哈勃望遠鏡拍攝的驚豔影像卻清晰地分辨出了星團中心 40 光年範圍內的恆星。該星團擁有近 15 萬顆恆星,集中分佈在直徑約 175 光年的區域內。 這個位於寶瓶座方向、距離地球約 5 . 5 萬光年的銀河系古老居民,也被稱為NGC 7089 ,已有 130 億年的歷史。最近發現,一條延伸的恆星碎片流——這是過去引力潮汐撕裂的標誌——與梅西耶 2 號有關聯。
原文:After the Crab Nebula, this giant star cluster is the second entry in 18th century astronomer Charles Messier's famous list of things that are not comets. M2 is one of the largest globular star clusters now known to roam the halo of our Milky Way galaxy. Though Messier originally described it as a nebula without stars, this stunning Hubble image resolves stars across the cluster's central 40 light-years. Its population of stars numbers close to 150,000, concentrated within a total diameter of around 175 light-years. About 55,000 light-years distant toward the constellation Aquarius, this ancient denizen of the Milky Way, also known as NGC 7089, is 13 billion years old. An extended stellar debris stream, a signature of past gravitational tidal disruption, was recently found to be associated with Messier 2.
※ 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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