This was the Big Bang, the beginning of the universe.

正是这 " 大爆炸" —— 宇宙之起始。

The idea is that, following the Big Bang, the universe began expanding.

这种观点认为，大爆炸之后宇宙持续的膨胀着。

Why did the universe emerge from the Big Bang the way it did?

宇宙缘何要从大爆炸中冒出呢？

200 million years after the Big Bang, the first stars in the cosmos burst into life.

就这样，在大爆炸 2 亿年后，第一颗恒星诞生了。

Exactly. So during the first few moments of the big bang, the universe was extremely hot and very small.

正是如此。所以在大爆炸的最初，宇宙非常热，而且非常小。

For several billion years after the Big Bang, the earth was still just a cloud of dust.

大爆炸后好几十亿年过去了，但地球还只是一团尘埃。

So basically, not long after the Big Bang, the only thing in the universe was hydrogen and helium.

所以基本上，大爆炸后不久，宇宙中唯一的东西就是氢和氦。

The Dark Ages period began nearly 380,000 years after the Big Bang, the explosion many scientists believe created the universe.

宇宙黑暗时代始于大爆炸之后的近38万年，许多科学家认为大爆炸创造了宇宙。

In 150 billion years we lose sight of the Big Bang, the cosmic microwave background cools to a point that it's undetectable.

1500亿年后，我们将看不见大爆炸，宇宙背景辐射冷却到无法侦测。

The Gunpowder Plot caused a big bang the very next year.

火药阴谋在次年引起了轰动。

It's all super cool to think about, but why is the Big Bang the leading theory?

想想都超级酷，但为什么大爆炸是主导理论？

One of these galaxies may have formed only 350 million years after the Big Bang – the event that explains the beginning of the universe.

其中一个星系可能是在宇宙大爆炸后（宇宙大爆炸解释了宇宙的起源）3.5亿年形成的。

And this is a moment before the big bang, the explosion that supposedly many argue made our universe.

这是大爆炸前的一刻，据说许多人认为大爆炸创造了我们的宇宙。

Then, by 20 minutes after the Big Bang, the temperature had dropped low enough that fusion could no longer occur.

然后， 到大爆炸后 20 分钟，温度下降到足以不再发生聚变。

In the first billionth of a trillionth of a second after the Big Bang, the ends of these tiny, tiny wormholes were pulled light-years apart; scattering them through the universe.

在大爆炸之后的万亿分之一秒里，这些小小的虫洞的末端被拉扯到数光年外，散落在宇宙之中。

In the first few seconds after the Big Bang, the universe was a sea of free electrons and atomic nuclei, so unbelievably hot and dense that not even photons could escape that opaque cosmic pinball machine.

在大爆炸后的最初几秒钟，宇宙是自由电子和原子核的海洋，温度高得令人难以置信， 密度大到连光子都无法逃脱那台不透明的宇宙弹球机。