1.
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。
2.
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。
3.
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。
4.
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。
5.
Precise thermodynamic equilibrium may never be achieved in a microscopic realm within gaseous nebulae.
精确的热动平衡永远不会在气体星云的一个微观范围内达到。
6.
The remnant nebular gas pervades the interplanetary space.
星云的残余气体充斥星际空间。
7.
clouds of particles or gases occurring throughout interstellar space.
遍及星际空间的微粒或气体组成的云。
8.
Thick clouds of interstellar gas absorb most of the light and screen other stars from us.
恒星间气体所形成的厚云层，吸收大部分的光，并遮住其他星星。
9.
the theory that the solar system evolved from a hot gaseous nebula.
太阳系是产生于一个星云热气体的理论。
10.
New stars continued to come into being from the gas clouds of the disk.
新的恒星继续从圆盘中的气体云中形成。
11.
A star is formed when a cloud of gas collapses from the interstellar medium toward high density.
一个气体云自星际物质中坍缩，密度达到很高时，即形成了一个恒星。
12.
The great gas pillar is being eroded by the ultraviolet radiation from the hottest newborn stars in the nebula.
壮丽的气体柱正被星云中新生的炽热恒星发出的紫外线所侵蚀。
13.
International Satellite Cloud Climatology Project
国际卫星云气候学项目
14.
International Satellite Cloud Climatology Project (ISCCP)
国际卫星云气候学计划
15.
The Great Nebula is a cloud of glowing gas centered on four hot, blue stars located about 1, 500 light-years from the earth.
这个大星云是以离地球大约1500光年的四颗很热的蓝星为中心的发光气体云。
16.
The spiral nebulae are impressive objects.
旋涡星云是迷人的天体。
17.
Interstellar gas clouds frequently collide and convert their kinetic energy into shock waves and radiation.
星际气体云经常在碰撞间将动能传给冲击波和辐射。
18.
Massive dark clouds of gas and dust are silhouetted against the flaming starlight.
大量气体和尘埃的暗云在炽热的星光下形成剪影。