梅西耶101
(原标题: Messier 101)
2023-06-02
浏览次数: 13
大而美丽的螺旋星系M101是查尔斯·梅西耶著名的星表中最后的一个条目，但绝对不是最不重要的一个。这个星系直径约17万光年，非常巨大，几乎是我们银河系的两倍大。M101也是罗斯勋爵19世纪的大型望远镜——帕森敦利维坦望远镜观测到的原始螺旋星云之一。哈勃太空望远镜在20世纪和21世纪记录了51张照片，加上地面望远镜的额外数据，这幅马赛克图像横跨M101的中心区域，跨度约4万光年，是哈勃发布的分辨率最高的螺旋星系肖像之一。这张清晰的图像显示了星系正面的恒星和尘埃盘以及背景星系的惊人特征，其中一些可以通过M101本身看到。M101也被称为风车星系，位于大熊座北部的边界内，距离我们大约2500万光年。
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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.