The gas glows, and we call this an emission nebula.

气体会发光，我们称之为发射星云。

He saw clusters of stars, brightly colored nebulas, even entire galaxies!

他看到了无数星团，明亮的星云，甚至还看到了整个银河！

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。

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——也就是星云。

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、氢气、氦气及其他气体组成的云。

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星云。

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。

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。

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其中的气体和它的温度。

Some nebulae are small and dense, others can be dozens or hundreds of light years across.

一些星云小而稠密，另一些星云的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.

因为当我们凝视星云时，我们看到的并不是单一的化学元素。

A typical density in a gas nebula is only a few thousand atoms per cubic centimeter.

气体星云的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.

整个星云由位于其中心的四颗恒星照亮，统称为梯形星。

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宇宙之中。

Really, a nebula is barely more than a vacuum.

实际上，星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， 稠密分明， 清净始。

The Orion nebula is one of the wonders of the universe.

猎户座星云是宇宙中的奇迹之一。

He discovered that this was not, in fact, a nebula.

他发现这实际上不是星云。