The size of the nebula at this stage is inversely proportional to its mass.
这个阶段的星云大小与其质量成反比。
And here you see the Crab Nebula.
这是蟹状星云。
A nebula is a universe in the making.
一个星云是一个正在形成的宇宙。
我们创造了一座星云！
这是一座星云！
What could cause a nebula to appear square?
什么因素让星云看起来像个正方形？
Extragalactic nebula is invisible to the naked eye.
我们用肉眼是看不到河外星系的。
Most of this matter was pulled to the center of the nebula.
大部分气尘云物质凝聚到太阳星云中心。
The entire nebula might even look like a face of a monster.
整个星云看起来就像是怪物的脸。
You know, they say that you can see the Crab Nebula. Wow, look…
你知道吗，据说可以看到蟹状星云…哇，你看…
We have identified the crab nebula as the debris of this explosion.
我们已证明蟹状星云就是这次爆炸的遗迹。
The Sun still contains most of the matter from the initial solar nebula.
太阳依然含有原始太阳星云的大部分物质。
Star born after rise of mankind making its mark with massive hourglass nebula.
人类的出现让巨大的沙漏星云有了标志并由此诞生星星这一概念。
The same cannot be said for the recently discovered Soap Bubble Nebula, however.
然而，对于最近发现的肥皂泡星云（Soap Bubble Nebula）来说，情况就不同了。
They tower above the surface of a molecular cloud on the edge of the nebula.
它们从星云底部的一片分子云表面耸立而出。
This photogenic nebula can be seen in the south with even a small telescope.
这张照片中的星云可在南半球用小型的望远镜来观赏。
Obviously, a line of astroid nebula is a result which the star old age evolves.
可见，行星状星云是恒星晚年演化的结果。
Obviously, a line of astroid nebula is a result which the star old age evolves.
可见，行星状星云是恒星晚年演化的结果。
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