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汉语拼音：xīng yún

由气体和尘埃物质组成的、呈云雾状的天体。同恒星相比，星云具有质量大、体积大、密度小的特点。

1. 看来像云雾状的天体。银河系内太阳系以外一切非恒星状的气体尘埃云。

   孙犁 《秀露集·万国儒＜欢乐的离别＞小引》：“生活就像太空的星云一样，它是浑然一体、千变万化、互相涉及、互为因果的。” 贺敬之 《放歌集·东风万里》：“无限宇宙的星云，正向我们传来响不断的回音。” 艾青 《光的赞歌》：“每一个人都是一个生命，人世银河星云中的一粒微尘。”

• You can see nebulae in the clear summer sky.

  在晴朗的夏夜可以看到天上的星云.

• The size of the nebula at this stage is inversely proportional to its mass.

  这个阶段星云的大小与其质量成反比。

• The element hydrogen comprises 90 % of the matter in gaseous nebulae.

  元素氢占气体星云物质的百分之九十.

• Some nebulae appear to be completely engulfed by exceedingly large molecular clouds.

  有些气体星云似乎被极其巨大的分子云完全包围.

• 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.

• The investigation of dark nebulas has been facilitated by a new discovery.

  对暗星云的研究被一种新发现所推进.

• This suggest that the nebulas are aggregates of stars.

  这说明星云是恒星的聚集体.

• Galactic nebulas are masses of diffuse material within our galaxy.

  银河星云是我们星系中的一团团弥散物.

• A nebula is really a discrete mass of innumerous stars.

  一团星云实际上是无数星体不连续的集合体.

• Many objections can be raised to this picture of planetary nebula formation.

  形成行星状星云的这一图象可能会引起许多异议.

• The remnant nebular gas pervades the interplanetary space.

  星云的残余气体充斥星际空间.

• Planetary nebulae are a type of isolated gaseous nebulae possessing a fair degree of bilateral symmetry.

  行星状星云是一类孤立的气体星云,具有相当程度的双侧对称性.

• Such tumultuous, often visually spectacular, interstellar regions surrounding youthful stars are known as gaseous nebulae.

  这种环绕着年轻星的动荡且常常是壮观的星际区域,叫做气体星云.

• These sources are generally viewed in projection against radio nebulae representing the remnants of supernova outbursts.

  这类源一般都投影在超星爆发残骸的射电星云上.

• The filaments are expanding into space at a speed of roughly 5,000 kilometers per second.

  这些纤维状星云物质以每秒大约5000公里的速度向宇宙空间扩展.