Extragalactic nebula is invisible to the naked eye.
我们用肉眼看不到河外星系。
You can see nebulae in the clear summer sky.
在晴夜可以看到天上星云。
A bit of mould is a pleiad of flowers;a nebula is an ant-hill of stars.
一粒霉菌一簇美不胜收花朵，一撮星云无数天体蚁聚。
The tiny but intriguing yellowish arc visible near the blue nebulae marks young variable star R Coronae Australis.
在蓝色星云附近，微小但迷人微黄色弧状可见物年轻可见恒星南冕座R星位置。
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.
当我们星云在自身重力作用下崩溃和更加快速地旋转时，星云中心形成密集物质块。这叫做原恒星。
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The gas glows, and we call this an emission nebula.
体会发光，我们称之为发射星云。
The orion nebula is a special kind of nebula called a stellar nursery.
猎户座星云是一种特殊星云，叫做恒星摇篮。
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星云，是一种由尘埃、氢、氦及体组成的云。
He saw clusters of stars, brightly colored nebulas, even entire galaxies!
看到了无数星团，明亮的星云，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.
一些星云小而密，另一些星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.
但是一开始这星云或多或少更像个不成形的。
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星云。
Stars are born in some nebulae, and create new ones as they die.
恒星在一些星云中诞生，并在消亡的过程中创造新的星云。
It is a nebula: a star-forming region where new stars are being born.
一个正在诞生新恒星的恒星形成区域。
Although most emission nebulae look substantial, they're actually incredibly tenuous.
虽然大多数发射星云看起来很可观，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.
发射星云的颜色取决于中的体和它的温度。
Among the other four images were two that showed huge clouds of gas and dust – called nebulas.
在四张照片中，有两张展示了巨大的体和尘埃云——也就是星云。
Because when we look deep into the nebula, we don't just see individual elements.
因为当我们凝视星云时，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.
这是位于猎户座星带下方的发射星云。
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，形成新的星云，即一大团富含化学物质的云团飘逸在宙之中。
From spectral lines, the composition of nebulae.
从谱线看，星云的组成。
At the centre of the nebula lies the remnant of the star, its core, crushed by the force of gravity.
在星云的中心处，这颗恒星的星核依然存在着，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.
当盘古破开星云， 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，我们在大多数发射星云中都能看到这种颜色。
The Orion nebula is one of the wonders of the universe.
猎户座星云是宙中的奇迹之一。
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详细解释
看不到河外星系
。
宙的奇迹 宙的奇迹 宙的奇迹 宙的奇迹 
夜可以看到天上
年轻可见恒星南冕座R星
体会发光，我们称之为发射星云。
密，另一些星云的直径则可达数十或数百光年。
。
宙之中。
