(单词翻译:单击)
Hey there! Welcome to Life Noggin!
大家好！欢迎来到脑洞大开的生命奇想！
The Earth is huge, its surface area is over 500 million square kilometers and it currently holds over 7 billion people.
地球很大，表面积超过5亿平方公里，目前拥有超过70亿人口。
But it's nothing compared to the solar system, which is billions of kilometers across.
但它数十亿公里的太阳系相比，是微不足道的。
And that is still nothing compared to the Milky Way galaxy.
与银河系相比，这更算不了什么。
And if we zoom out even more, we can really start to appreciate how huge the universe actually is.
如果我们再后退一步看，就能真正开始意识到宇宙到底有多大。
But we might be able to take this one step further, because we might be living in something called a multiverse, where there's not just one universe, but potentially an infinite amount of them.
但是我们可以前进一步，因为我们可能生活在一个叫做多元宇宙的东西里，那里不仅有一个宇宙，而是可能有无限的宇宙。
And if this is true, some scientists think that we have the Big Bang to thank.
科学家认为，如果这是真的，我们应该感谢大爆炸。
See, for a fraction of a second after the Big Bang, the universe expanded incredibly quickly and then stopped.
在宇宙大爆炸后的一小段时间里，宇宙膨胀得非常快，然后就停止了。
And over the next 14 billion years, it cooled down and formed stars, galaxies, and eventually life!
在接下来的140亿年里，它冷却下来形成了星体，星系，最终形成生命!
But there's reason to believe that there are some pockets of space that haven't stopped inflating and some others that have at different times.
但我们有理由相信，有些地方还没有停止膨胀，而另一些地方则在不同的时间停止膨胀。
This is called the "eternal inflation" theory and each of these bubbles of space forms it own, isolated universe.
这就是所谓的“永恒膨胀”理论，每一个空间的气泡都形成了它自己的、孤立的宇宙。
And interestingly, the laws of physics and the fundamental constants might not be the same there.
有趣的是，那里的物理定律和基本常数可能不一样。
And that got me thinking: what would a parallel universe even be like?
这让我思考：平行的宇宙会是什么样的?
Well, in a lot of these universes, you and I might not even exist, sorry sci-fi fans. I know, that's hard to hear.
在很多这样的平行宇宙中，你和我可能都不存在，抱歉科幻迷。我知道，这听起来很让人难过。
See, if the laws of physics were different enough, like if the forces between particles were too weak, atoms might never form.
看，如果物理定律不同，比如粒子之间的作用力太弱，原子就不会形成。
And that means no molecules, no stars and planets, and no life.
这意味着没有分子，没有恒星和行星，也没有生命。
Sounds pretty boring over there. Worst vacation spot ever.
听起来很无聊。真是史上最糟糕的度假胜地。
That said, there's also the possibility that the laws of physics in some of those universes are so close to ours that intelligent life is possible.
不过，在某些宇宙中，如果它们的物理定律与我们的相似，那么智慧生命是可能存在的。
And if there's an infinite amount of them, it's pretty likely that there's a bubble universe that's very similar to our own.
如果它们的数量是无限的，很有可能存在一个与我们这个宇宙非常相似的气泡宇宙。
Maybe in another universe, I'm really buff and strong. Ok, I'm not gonna get carried away.
也许在另一个宇宙中，我真的很强壮。好吧，我不会得意忘形的。
And interestingly, it is theoretically possible that some of these neighboring universes can collide with each other.
有趣的是，从理论上讲，这些相邻的宇宙可能会相互碰撞。
In fact, it's possible that our universe may have collided with others in the past.
事实上，我们的宇宙可能在过去与它们发生过碰撞。
The main hypothesis is that a collision like this might have left a mark on the cosmic microwave background that we could detect.
主要的假设是这样的碰撞可能在宇宙微波背景上留下了一个印记，我们可以探测到。
But sadly, the researchers haven't found anything so far and there isn't any proof that parallel universes even exist.
但令人遗憾的是，研究人员至今什么都没有发现，也没有发现任何平行宇宙存在的证据。
But if they do, and if they contain life, it would be interesting to see what that life was like.
但是如果他们确实存在，如果那里也有生命，那么看看他们的生活是什么样子会很有趣。
What do you think? Do you believe that parallel universes are out there? Let me know in the comments!
你是怎么想的？你相信平行宇宙是存在的吗？在评论中告诉我吧!
And if you want to know why we haven't found life in our galaxy yet, click here to find out.
如果你想知道为什么我们还没有在银河系中找到生命，请点击这里找到答案。
Since 1960 Frank Drake and others have been scanning the stars, listening for spikes in microwave radiation.
自1960年以来，弗兰克·德雷克(Frank Drake)等人一直在扫描恒星，聆听微波辐射的峰值。
But it's like trying to tune a radio with a bandwidth 15 times bigger than your car's.
但这就像用比你的汽车大15倍的带宽来调整收音机。
Earth itself has been sending radio waves into space for hundreds of years.
数百年来，地球本身一直在向太空发射无线电波。
There's a link in the description if you're on mobile. As always, I'm Blocko. This has been Life Noggin. Don't forget to keep on thinking.
如果你是在手机上观看的话，描述区中有一个链接。我是宝高。这里是脑洞大开的生命奇想。思考不要停。
