梅西耶81
(原标题: Messier 81)
2025-03-27
浏览次数: 30
地球天空中最明亮的星系之一与我们的银河系大小相似：大而美丽的梅西耶81。这个巨大的螺旋星系也被称为NGC 3031或18世纪的发现者的波德星系，可以在大熊座的北部找到。这张清晰、详细的望远镜图像显示了M81明亮的黄色核心、蓝色旋臂、粉红色的恒星形成区域和广阔的宇宙尘埃带。但是一些尘埃带实际上穿过了星系盘（中间左边），与其他突出的螺旋特征相反。这些偏离轨道的尘埃带可能是M81和M82星系近距离接触的结果，M82潜伏在这个框架之外。对M81中变星的仔细观察已经确定了一个外部星系的距离——1180万光年。
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One of the brightest galaxies in planet Earth's sky is similar in size to our Milky Way Galaxy: big, beautiful Messier 81. Also known as NGC 3031 or Bode's galaxy for its 18th century discoverer, this grand spiral can be found toward the northern constellation of Ursa Major, the Great Bear. The sharp, detailed telescopic view reveals M81's bright yellow nucleus, blue spiral arms, pinkish starforming regions, and sweeping cosmic dust lanes. But some dust lanes actually cut across the galactic disk (left of center), contrary to other prominent spiral features. The errant dust lanes may be the lingering result of a close encounter between M81 and the nearby galaxy M82 lurking outside of this frame. Scrutiny of variable stars in M81 has yielded a well-determined distance for an external galaxy -- 11.8 million light-years.
© Lorand Fenyes