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.
点缀着暗淡尘埃的团团恒星和发光星云，标记着银河系缓慢变化的旋涡外形。
Clouds of stars and glowing gas, with patches of darkening dust, mark the slow-changing spiral patterns of the Galaxy disk.
点缀着暗淡尘埃的团团恒星和发光星云，标记着银河系缓慢变化的旋涡外形。
Clouds of stars and glowing gas, with patches of darkening dust, mark the slow-changing spiral patterns of the Galaxy disk.
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