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

气体会发光，我们称之为发射星。

The orion nebula is a special kind of nebula called a stellar nursery.

猎户座星是一种特殊星，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，是一种由尘埃、氢气、氦气及其他气体组成的。

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

一些星小而稠密，另一些星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。

Stars are born in some nebulae, and create new ones as they die.

恒星在一些星中诞生，并在消亡的过程中创造新的星。

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——也就是星。

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

因为当我们凝视星时，我们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。

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，即一大团富含化学物质的团飘逸在宇宙之中。

From spectral lines, the composition of nebulae.

从谱线，星的组成。

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。

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中都能到这种颜色。

When Pan Gu broke the nebula apart, The dense and pure defined, did clearing start.

当盘古破开星， 稠密分明， 清净始。

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

猎户座星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。