In the 14 billion years since the Big Bang, galaxies have been created, filled with stars, planets, and moons, and the universe has been expanding the whole time.
大爆炸以后的140亿年里，包罗万象的星河创生了，它囊括了无数的恒星，行星以及卫星。宇宙还在不停地膨胀。
We've learnt space is quite big, at least a hundred and fifty billion light years across.
我们探究后得知太空非常辽阔，至少有1500亿光年长。
The universe may be infinite; it might literally go on forever.
宇宙也许是无限；它可能会永远膨胀下去。
The answer is it doesn't have to be anything, in principle, the universe could be infinite and there's no outside. Or it could be closed on itself. It could be such if I looked far enough in that direction I see the back of my head.
原则上讲宇宙有很多可能性，它可以是无限的，没有尽头，或者它是封闭的。很可能是这样，如果朝一个方向观察得足够远，我可能会看见我的后脑勺。
We may never know the Big Bang produced a universe that goes on forever. But we do know that the Big Bang hasn't stopped yet.
我们不可能知道大爆炸形成的宇宙会不会永远膨胀下去。但是我们知道大爆炸还没有停止。
The Big Bang is really continuing now, we are continuing to bang if you want in the sense the expansion of the universe is continuing.
现在大爆炸确实在继续，宇宙确实在继续膨胀，从这个意义上讲，我们也会继续爆炸。
One of the most astounding discoveries in the last few years has been the realization that our universe is not slowing down like we once thought, but is actually speeding up, is accelerating, is in a run-away mode. We now believe there's something called dark energy, the energy of nothing that is pushing the galaxies apart, and is killing the universe.
过去的几年里，最令人震惊的发现之一就是人类意识到，宇宙并没有像我们想的那样减速膨胀，而是在加速，以近乎逃跑的方式在加速。现在我们相信宇宙间存有一种物质叫做暗能量。这种能量会推离宇宙推，进而将其毁灭。
We can't see this destructive force and we have no idea why it exists, but it could mean the end of everything created in the Big Bang. If dark energy continues pushing the universe apart, our milky-way galaxy could become a lonely outpost, a hundred billion years from now, most of our galactic neighbors will be out of sight. Stars will burn out, galaxies will grow dark, even atoms will tear apart. The birth of the universe, the Big Bang was over in a flash, but the death of our universe will take almost forever.
我们看不见这种破坏性的力量，我们也不知道它为何存在，但是它意味终结，大爆炸所创造的一切都会终结。如果暗能量继续分离宇宙，我们的银河系就会变成孤独的前哨。再过1000亿年，大多数比邻的星系将会从视野里消失。恒星会燃尽，星系会黯然，就连原子也会分崩离析。宇宙的起源-大爆炸会在瞬间结束，但是宇宙却差不多永远存在。
That great philosopher of the western world, Willie Allan, once said “eternity is an awful long time, especially toward the end”.
西方国家一位伟大的哲学家威廉·艾伦说过，“永恒是长的可怕的时间，尤其是在接近尾声时。”
Figuring out how our universe will end is as dark a mystery as the Big Bang. It could collapse back in on itself like a balloon when the air is let out.
宇宙如何终结就如谜一样黑暗的大爆炸。它可能会像气球漏气一样坍塌回原形。
