Extragalactic nebula is invisible to the naked eye.
我眼是看不到河外系的。
You can see nebulae in the clear summer sky.
在晴朗的夏夜可以看到天上的。
The tiny but intriguing yellowish arc visible near the blue nebulae marks young variable star R Coronae Australis.
在蓝色近，微小但迷人的微黄色弧状可见物标了年轻可见恒南冕座R的位置。
Cosmic clouds of hydrogen gas and dust abound in this gorgeous skyscape, stretching through Monocerous in the neighborhood of The Cone Nebula.
在这张绚丽的天空美景中，充满了氢气和尘埃组成的宇宙，一直延伸到锥形近的麒麟座内。
As our nebula began to collapse under its own gravity and spin faster, a dense clump of matter formed in the center. It's called a protostar.
当我的在自身重力作下崩溃和更加快速地旋转时，中心形成了密集的物质块。这叫做原恒。
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When that happens, you get that idealized soap bubble nebula.
如此一来，就会得到理想的肥皂泡云。
So planetary nebulae really may owe their existence to planets!
所以状云的存在可能真的要归功于！
The orion nebula is a special kind of nebula called a stellar nursery.
猎户座云一种特殊云，叫做恒摇篮。
However, this nebula started off more or less as a big shapeless blob.
但一开始这云或多或少更像个不成形的水滴。
This object is what we call a planetary nebula.
这个物体就我们所说的状云。
Orion's sword is home to the great orion nebula, a cloud of dust, hydrogen, helium, and other gases.
猎户的位置有猎户座云，一种由尘埃、氢气、氦气及其他气体组成的云。
Planetary nebulae can be a bit tough to observe: most are small and faint.
它们大多数都很小而且很暗。
The glow in a planetary nebula is due to the hot central white dwarf exciting the gas.
状云中的光芒由中央炽热的白矮激发气体产生的。
That's a very common shape for planetary nebulae.
这状云很常见的形状。
The crab nebula is visible tonight.
今晚能看见蟹状云。
This swirling mass or " nebula" began to cool and, as it did, it condensed and separated into rings of particles.
这个巨大旋涡状物质或" 云" 开始冷却，而且，随着冷却开始聚集，并分开变成粒子环。
And thus, only in three dimensions can a nebula or infant galaxy start out not flat and end up flat
因此，只有在三维空间才可能有云或系诞生时不平面而最後变成平面。
The most famous is the Crab nebula, from a star we saw blow up in the year 1054.
其中最著名的蟹状云，它来自于我们在1054年看到的恒爆炸。
This is an emission nebula located just below Orion's belt.
这位于猎户座带下方的发射云。
Their light is so fierce it illuminates the entire nebula, which is about 20 light years across.
它们发出的光非常强烈，照亮了整个直径约为 20 光年的云。
The entire nebula is lit by four stars located in its heart, collectively called the Trapezium.
整个云由位于其中心的四颗恒照亮，统称为梯形。
If the sky is dark enough, you can see the nebula with just your eyes—but you can get a better look with binoculars or a telescope.
如果天空够暗，肉眼就能看到云，不过用双筒镜或望远镜可以看的更清楚。
Mind you, the gas in a planetary nebula is still expanding, cruising outward from its initial momentum of being thrown off the star.
请注意，状云中的气体仍在膨胀，从最初被抛出恒时的动量向外弥漫。
Will it, one day in the distant future be at the center of a planetary nebula it expels as it dies?
在遥远的未来的某一天，它会在死亡时被驱逐到状云的中心吗？
The first planetary nebula was discovered in 1764 by the French astronomer Charles Messier, who spent years scanning the skies looking for comets.
1764年，法国天文家查尔斯·梅西耶(Charles Messier)发现了第一个状云，他花了数年时间在天空中寻找彗。
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划词翻译
详细解释
眼是看不到河外
系的。
课堂 课堂 课堂 
。
近，微小但迷人的微黄色弧状可见物标
了年轻可见恒
一种特殊
的位置有猎户座
家查尔斯·梅西耶(Charles Messier)发现了第一个
