完美的螺旋
(原标题: A Perfect Spiral)
2021-08-13
浏览次数: 34
如果不完美，这个螺旋星系至少是最上镜的星系之一。M74是一个由大约1000亿颗恒星组成的岛屿宇宙，距离双鱼座3200万光年，呈现出一幅华丽的正面景象。M74被归类为Sc星系，明亮的蓝色星团和黑暗的宇宙尘埃带勾勒出它优美的旋臂的宏伟设计。这幅清晰的合成图是由哈勃太空望远镜的高级巡天相机记录的图像数据构成的。它横跨M74表面约30,000光年，包括记录氢原子发射的曝光，突出了星系大型恒星形成区域的红色光芒。M74的表面亮度比梅西耶星表中的大多数星系都要低，因此有时被称为幽灵星系。著名的APOD图片提交：英仙座流星雨2021
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If not perfect then this spiral galaxy is at least one of the most photogenic. An island universe of about 100 billion stars, 32 million light-years away toward the constellation Pisces, M74 presents a gorgeous face-on view. Classified as an Sc galaxy, the grand design of M74's graceful spiral arms are traced by bright blue star clusters and dark cosmic dust lanes. This sharp composite was constructed from image data recorded by the Hubble Space Telescope's Advanced Camera for Surveys. Spanning about 30,000 light-years across the face of M74, it includes exposures recording emission from hydrogen atoms, highlighting the reddish glow of the galaxy's large star-forming regions. With a lower surface brightness than most galaxies in the Messier catalog, M74 is sometimes known as the Phantom Galaxy. Notable APOD Image Submissions: Perseid Meteor Shower 2021