1. a nebula that was once thought to be a star with its planets but is now thought to be a very hot star surrounded by an expanding envelope of ionized gases that emit a fluorescent glow because of intense radiation from the star. 
   一个原本被认为是带行星的恒星的星云，现在被认为是非常热的恒星，由扩大的离子态气体包层包围，由于恒星的剧烈辐射放射出光和热。
2. condensation model of the solar nebula 
   太阳星云凝聚模型
3. A powerful telescope can resolve a nebula into stars. 
   一架高性能的望远镜能从星云中分辨出星球来。
4. Of, relating to, or characteristic of a nebula. 
   星云的关于或类似星云的
5. The central or brightest part of a nebula or galaxy. 
   核星云或银河的中心或最亮部分

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