旋涡星云是离地球最近的行星状星云，位于宝瓶座南部。“旋涡星云”是天文学专有名词。
... spiral galaxy 旋涡星系; 旋涡星系 spiral nebula 旋涡星云; 旋涡星云 spiral pattern 螺纹; 螺纹 ...
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旋涡星云因为非常暗，难以得到它们的清晰的光谱。
Good spectra of the spiral nebulas are difficult to obtain because of their extreme faintness.
天体中， 从众多的硕大的旋涡状星云， 到坠落于地球上的微小的陨砂、陨尘， 普遍存在着螺旋状的结构形态。
There are commonly the helical structures in the celestial body from many gigantic whirl nebulae to small meteoric stone and dust falling to the Earth.
下载高分辨画面找寻一些梅西尔远方旋涡星系的精致图像，还有猫头鹰星云。
Download the higher resolution image to hunt for exquisite views of some of Messier's distant spiral galaxies and a more local owl.
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