Extragalactic nebula is invisible to the naked eye.
我们用肉眼是看到河外系的。
A bit of mould is a pleiad of flowers;a nebula is an ant-hill of stars.
一粒霉菌是一胜收的花朵,一撮是数天体的蚁聚。
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.
当我们的自身重力作用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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The gas glows, and we call this an emission nebula.
气体会发光,我们称之为发射云。
The orion nebula is a special kind of nebula called a stellar nursery.
猎户座云是一种特殊云,叫做摇篮。
Orion's sword is home to the great orion nebula, a cloud of dust, hydrogen, helium, and other gases.
猎户剑位置有猎户座云,是一种由、气、氦气及其他气体组成云。
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水滴。
Everything we find on the Earth today also originated in that nebula.
我们地上一切也都来源于那片云。
This is an emission nebula located just below Orion's belt.
这是位于猎户座带下方发射云。
It is a nebula: a star-forming region where new stars are being born.
一个正在诞生新形成区域。
The color of an emission nebula depends on the gas in it and how hot it is.
发射云颜色取决于其中气体和它温度。
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,有两张展示了巨大气体和云——也就是云。
Some nebulae are small and dense, others can be dozens or hundreds of light years across.
一些云小而稠密,另一些云直径则可达数十或数百光年。
Because when we look deep into the nebula, we don't just see individual elements.
因为当我们凝视云时,我们看到并不是单一化学元素。
A typical density in a gas nebula is only a few thousand atoms per cubic centimeter.
气体云典型密度只有每立方厘米几千个原子。
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四颗照亮,统称为梯形。
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,形成新云,即一大团富含化学物质云团飘逸在宇宙之中。
Really, a nebula is barely more than a vacuum.
实际上,云只不过是一个真空。
At the centre of the nebula lies the remnant of the star, its core, crushed by the force of gravity.
在云中心处,这颗核依然存在着,在引力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, 稠密分明, 清净始。
The Orion nebula is one of the wonders of the universe.
猎户座云是宇宙中奇迹之一。
He discovered that this was not, in fact, a nebula.
他发现这实际上不是云。
Nebula ads in HAI videos—so every town had a slightly different time.
HAI 视频中云广告——所以每个城镇时间都略有不同。
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