1.(astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust.
（天文学）恒星体系的总称；有恒星、星云和尘埃的数十亿系统之任何一个。
2.You can see nebulae in the clear summer sky.
在晴朗的夏夜可以看到天上的星云。
3.Planetary nebulae are not as airy and tranquil as their images suggest.
行星状星云并不如影像中所显现的那麽飘逸宁静。
4.While stars and nebulae look like specks or small patches of light . they are really enormous bodies.
星星和星云看起来只是斑点点，或者是小片的光，但它们确实是巨大的天体。
5.After a year, he signed on as a graduate student at Yerkes Observatory in Wisconsin and embarked on the work that would one day make him famous: studying faint, hazy blobs of light called nebulae (from the Latin word for cloud) that are visible through even a modest telescope.
一年之后，威斯康辛州的叶尔克斯天文台约聘他为研究生，他开始从事有朝一日会让他功成名就的工作：研究称之为星云(由拉丁的“云”而来)的一抹微弱、朦胧亮光，透过适当的望远镜就可以观察到星云。
6.The Doppler effect is widely used in astronomy for measuring the velocity at which distant stars or nebulae are approaching or receding.
多普勒效应在天文学上广泛应用于测量距离遥远的恒星或星云靠近我们或离开我们速度。
7.In just two months the ACS has already done more than open a new set of eyes to the beautiful world of galaxies and planetary nebulae that peivade our galactic neighborhood.
美国化学学会在两个月里远远不止为美丽的星系世界及其弥漫于其中的行星星云打开了一系列观察的眼睛。
