NGC 1309：一个有用的螺旋星系
(原标题: NGC 1309: A Useful Spiral Galaxy)
2025-08-18
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这个星系不仅漂亮，而且很有用。NGC 1309是一个距离我们约1亿光年的美丽螺旋星系，位于仙女座的河岸上。NGC 1309的跨度约为3万光年，大约是我们银河系的三分之一。由年轻恒星和尘埃带组成的蓝色星团可以看到NGC 1309的旋臂，因为它们绕着核心的一群较老的黄色恒星旋转。不仅是另一个漂亮的螺旋星系，对NGC 1309最近的两颗超新星和多颗造父变星的观测有助于校准宇宙的膨胀。不过，在你欣赏完这个美丽星系的宏伟设计之后，看看哈勃太空望远镜拍摄的这张清晰图像中记录的更遥远的背景星系阵列。
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This galaxy is not only pretty -- it's useful. A gorgeous spiral some 100 million light-years distant, NGC 1309 lies on the banks of the constellation of the River (Eridanus). NGC 1309 spans about 30,000 light-years, making it about one third the size of our larger Milky Way galaxy. Bluish clusters of young stars and dust lanes are seen to trace out NGC 1309's spiral arms as they wind around an older yellowish star population at its core. Not just another pretty face-on spiral galaxy, observations of NGC 1309's two recent supernovas and multiple Cepheid variable stars contribute to the calibration of the expansion of the Universe. Still, after you get over this beautiful galaxy's grand design, check out the array of more distant background galaxies also recorded in this sharp image from the Hubble Space Telescope.