nebular

1. They are truly lumps of nebular matter, probably similar in composition to the matter from which planets were assembled.: 它们的确是星云物质组成的团块，其组成物质可能与行星形成时的物质相似。

2. At one time it was thought that these matrix grains might be pristine nebular dust, the sort of stuff from which chondrules and inclusions were made.: 曾经有人认为，这些基质颗粒可能是原始的星云尘埃，即形成陨石球粒及其内含物的物质。

3. The remnant nebular gas pervades the interplanetary space.: 星云的残余气体充斥星际空间。

4. Ultraviolet radiation from the hot star powers the nebular glow.: 热恒星的紫外辐射使星云发光。

5. Within the Iris, dusty nebular material surrounds a hot, young star.: 在彩虹星云中，星云尘埃物质围绕着一颗炙热的年轻恒星。

6. (Astronomy) the nebular hypothesis of the origin of the solar system.: (天文学)关于太阳系起源的星云假说。

7. Wu Tongchun's nebular art is expressed by the character of traditional Chinese painting.: 吴同椿的星云世界是用中国画的特色来表现的。

8. Look for a small nebular patch North-East of bright star Deneb in the constellation of Cygnus.: 从天鹅座中的明亮恒星天津四往东北方向寻找，就能找到这一小片星云状光斑！

9. The magnitude of the turbulence then follows directly from the observed line with if the nebular gas temperature is known.: 如果已知星云气体的温度，则湍流的大小可直接从观测的谱线宽度得出。

10. If a protoplanet was large enough, soon enough, its gravity would pull in the nebular gas, and it would become a gas giant.: 如果一个原行星足够大，形成足够快，它的重力会拉入星云的气体，它就会变成一个巨型气体行星。

11. Normally this material is invisible, but some of it can be seen in silhouette against the nebular background, as long dust lanes and a small, dark, elliptical-shaped knot.: 平时，我们是看不见这些物质的，但是，我们通过星云这个背景可以看见它的一部分，它就像是一条长长的灰尘组成的细线，或者是一个一个很小的椭圆形的结。

12. The most obvious advantage is that 'because of their inability to scatter appreciably, nebular radio waves completely and genuinely delineate the distribution of nebular gas.: 因为星云对射电波的散射很小，所以最明显的优点就是能够全面而真实地勾画出星云气体分布的外貌。

13. Below the frame center and just to the right of Alnitak lies the Horsehead nebula, a dark indentation of dense dust that has perhaps the most recognized nebular shapes on the sky.: 画面中央偏下，也就是位在参宿一右方的马头星云，由致密的黑暗尘埃组成，应当是天空中最被认可的形状。

14. Below the frame center and just to the right of Alnitak lies the Horsehead nebula, a dark indentation of dense dust that has perhaps the most recognized nebular shapes on the sky.: 画面中央偏下，也就是位在参宿一右方的马头星云，由致密的黑暗尘埃组成，应当是天空中最被认可的形状。

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