Extragalactic nebula is invisible to the naked eye.
我们用肉眼看到河外系的。
You can see nebulae in the clear summer sky.
在晴朗的夏夜可以看到天上的云。
A bit of mould is a pleiad of flowers;a nebula is an ant-hill of stars.
一粒霉菌一簇收的花朵，一撮云无数天体的蚁聚。
The tiny but intriguing yellowish arc visible near the blue nebulae marks young variable star R Coronae Australis.
在云附近，微小但迷人的微黄弧状可见物标出了年轻可见恒南冕座R的位置。
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.
当我们的云在自身重力作用下崩溃和更加快速地旋转时，云中心形成了密集的物质块。这叫做原恒。
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The gas glows, and we call this an emission nebula.
气体会光，我们称之为云。
The orion nebula is a special kind of nebula called a stellar nursery.
猎户座云是一种特殊云，叫做恒摇篮。
Orion's sword is home to the great orion nebula, a cloud of dust, hydrogen, helium, and other gases.
猎户剑的位置有猎户座云，是一种由尘埃、氢气、氦气及其他气体组成的云。
He saw clusters of stars, brightly colored nebulas, even entire galaxies!
他看到了无数团，明亮的云，甚至还看到了整个银河！
Some nebulae are small and dense, others can be dozens or hundreds of light years across.
一些云小而密，另一些云的直径则可达数十或数百光年。
However, this nebula started off more or less as a big shapeless blob.
但是一开始这云或多或少更像个不成形的水滴。
Everything we find on the Earth today also originated in that nebula.
我们地球上的一切也都来源于那片云。
Stars are born in some nebulae, and create new ones as they die.
恒在一些云中诞生，并在消亡的过程中创造新的云。
It is a nebula: a star-forming region where new stars are being born.
一个正在诞生新恒的恒形成区域。
Although most emission nebulae look substantial, they're actually incredibly tenuous.
虽然大多数云看起来很可观，但它们实际上非常稀薄。
The color of an emission nebula depends on the gas in it and how hot it is.
云的颜色取决于其中的气体和它的温度。
Among the other four images were two that showed huge clouds of gas and dust – called nebulas.
在其他四张照片中，有两张展示了巨大的气体和尘埃云——也就是云。
Because when we look deep into the nebula, we don't just see individual elements.
因为当我们凝视云时，我们看到的并不是单一的化学元素。
This is an emission nebula located just below Orion's belt.
这是位于猎户座带下方的云。
Those elements will spread out to become a nebula, a rich chemical cloud drifting through space.
这些物质最后会扩散开来，形成新的云，即一大团富含化学物质的云团飘逸在宇宙之中。
From spectral lines, the composition of nebulae.
从谱线看，云的组成。
At the centre of the nebula lies the remnant of the star, its core, crushed by the force of gravity.
在云的中心处，这颗恒的核依然存在着，在引力的作用下它已是面目全非。
When Pan Gu broke the nebula apart, The dense and pure defined, did clearing start.
当盘古破开云， 密分明， 清净始。
Hydrogen, for example, glows most strongly in the red, and we see that color in most emission nebulae.
例如，氢的红光最为强烈，我们在大多数云中都能看到这种颜色。
The Orion nebula is one of the wonders of the universe.
猎户座云是宇宙中的奇迹之一。
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详细解释
看
到河外
系的。
收的花朵，一撮
光，我们称之为
密，另一些
云的组成。
