梅西耶 101
Messier 101

發表日期:2025-05-16
美麗的大螺旋星系M 101 是查爾斯-梅西耶(Charles Messier)著名星表中的最後一個條目,但絕對不是最不重要的條目之一。這個星系寬約 17 萬光年,非常巨大,幾乎是我們銀河系的兩倍。M 101 也是羅塞勳爵的 19 世紀大型望遠鏡--帕森鎮利維坦望遠鏡最初觀測到的螺旋星雲之一。這張馬賽克照片由哈勃太空望遠鏡在 20 世紀和 21 世紀記錄的 51 次曝光以及地面望遠鏡提供的其他資料拼接而成,橫跨 M 101 中心區域約 4 萬光年,是哈勃發布的清晰度最高的螺旋星系肖像之一。這幅清晰的影像展示了該星系由恆星和塵埃組成的正面圓盤以及背景星系的驚人特徵,有些星系甚至可以透過 M 101 本身看到。M 101 也被稱為 "針輪星系",位於大熊座北部的邊界內,距離地球約 2500 萬光年。
原文:Big, beautiful spiral galaxy M101 is one of the last entries in Charles Messier's famous catalog, but definitely not one of the least. About 170,000 light-years across, this galaxy is enormous, almost twice the size of our own Milky Way. M101 was also one of the original spiral nebulae observed by Lord Rosse's large 19th century telescope, the Leviathan of Parsontown. Assembled from 51 exposures recorded by the Hubble Space Telescope in the 20th and 21st centuries, with additional data from ground based telescopes, this mosaic spans about 40,000 light-years across the central region of M101 in one of the highest definition spiral galaxy portraits ever released from Hubble. The sharp image shows stunning features of the galaxy's face-on disk of stars and dust along with background galaxies, some visible right through M101 itself. Also known as the Pinwheel Galaxy, M101 lies within the boundaries of the northern constellation Ursa Major, about 25 million light-years away.
※ 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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