deep-sky objects 深空天体
As the view level increases, you will normally want to show fainter deep sky objects.
在视场等级增加时，你通常希望看到更黯淡的深空天体。
All deep sky objects have catalog Numbers - indeed, most have 'many' catalog Numbers as we've already seen!
所有的深空天体都有星表编号——事实上，正向我们前面看到的那样，大部分都有许多编号！
Many of the brightest deep sky objects also have "popular names" by which they're often referred to, such as "Andromeda Galaxy", "North America Nebula", "Blinking Planetary", and so on.
那些最亮的深空天体还有常用“俗名”，比如“仙女座大星系”、“北美洲星云”、“闪耀星云”等等。
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