Astronomy Picture of the Day——鲁宾星系
Rubin's Galaxy
Image Credit: NASA, ESA, B. Holwerda (University of Louisville)
Explanation: In this Hubble Space Telescope image the bright, spiky stars lie in the foreground toward the heroic northern constellation Perseus and well within our own Milky Way galaxy. In sharp focus beyond is UGC 2885, a giant spiral galaxy about 232 million light-years distant. Some 800,000 light-years across compared to the Milky Way's diameter of 100,000 light-years or so, it has around 1 trillion stars. That's about 10 times as many stars as the Milky Way. Part of a current investigation to understand how galaxies can grow to such enormous sizes, UGC 2885 was also part of astronomer Vera Rubin's pioneering study of the rotation of spiral galaxies. Her work was the first to convincingly demonstrate the dominating presence of dark matter in our universe.
鲁宾星系
这幅照片由哈勃望远镜拍摄，光芒四射的前景亮星属于我们的银河系，位于北天的英仙座中。在它后面是一个距离地球2.32亿光年的巨大的旋涡星系UGC 2885。与10万光年的银河系相比，这个星系的直径达80万光年，包含大约1万亿颗恒星，数量是银河系的10倍。UGC 2885不仅是当前科学家们关于星系是如何增长到如此巨大规模的研究目标 ，还是天文学家Vera Rubin 对旋涡星系旋转性质的开创性研究的一部分。她的工作首次令人信服了暗物质在宇宙中占主导地位。
高清原图地址：
https://apod.nasa.gov/apod/image/2001/RubinsGalaxy_hst2000.jpg
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