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

气体会，们称之为射星云。

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、氢气、氦气及其他气体组成的云。

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年。

However, this nebula started off more or less as a big shapeless blob.

但是一开始这星云或或少更像个不成形的水滴。

Everything we find on the Earth today also originated in that nebula.

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.

虽数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.

射星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，有两张展示了巨的气体和尘埃云——也就是星云。

Because when we look deep into the nebula, we don't just see individual elements.

因为当们凝视星云时，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，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，这颗恒星的星核依存在着，在引力的作用下它已是面目全非。

Hydrogen, for example, glows most strongly in the red, and we see that color in most emission nebulae.

例如，氢的红最为强烈，们在数射星云中都能看到这种颜色。

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.

他现这实际上不是星云。