Cosmologists don't know what dark energy is.

宇不知道暗能量是什么。

Hawking was also a cosmologist, a mathematician and an author.

霍金也是一位宇、数和作。

And that lets cosmologists look back to the very dawn of the universe.

让宇回顾了宇时期。

For cosmologists, the expansion of the universe is not a problem.

对宇来说，宇膨胀不是问题。

Cosmologists are making sense of startling discoveries.

宇正在研究那些惊人发现。

Cosmologists worked out that there must be some form of energy that keeps the universe from collapsing.

宇推论必定存在某种能量使宇免于坍缩。

But cosmologists take everything into account, by using careful measurements of the expansion rate.

但宇仔细测量了膨胀率，把一切都考虑在内。

Cosmologists have come up with a name, dark energy.

宇给它起了名字，暗能量。

Figuring out what dark energy is, is probably the number one goal of cosmologists today.

搞清楚暗能量是什么可能是宇现在排在首位目标。

In this context, Boltzmann's paradox has found renewed interest by contemporary cosmologists.

在这种情况下，玻尔兹曼悖论重新引起了当代宇兴趣。

While a present-day cosmologist might describe the stabilising influence of our Earth's tilt.

而当今宇可能会描述月球对地球倾斜稳定起了很大作用。

That may sound absurd, but it's kept several generations of top cosmologists up at night.

听起来可能有些奇怪，但是这让好几代顶级宇彻夜难眠。

David Schlegel is a cosmologist from the University of California at Berkeley.

大卫·施莱格尔是一位宇，来自于伯克利加州大分校。

And by comparison, the entire universe is very simple and even the cosmologists will admit that.

相比之下，整个宇非常简单，甚至宇也会承认这一点。

For cosmologists, the road ahead has become a lot less certain.

对宇来说，前进道路上充满了太多不确定因素。

But for cosmologists like Sean Carroll, that's not enough.

但对于肖恩·卡罗尔这样宇来说，这还不够。

Anthony Aguirre, from the University of California in Santa Cruz, is a theoretical cosmologist.

安东尼·阿吉雷来自于圣克鲁斯加利福尼亚大，是一位理论宇。

So as cosmologists what we do is we apply Einstein's theory of relativity to the universe as a whole.

作为宇，我们要做就是把爱因斯坦相对论应用到整个宇中。

Here, astronomers like Richard Ellis are working on a problem that has been all-consuming for cosmologists since Edwin Hubble.

理查艾利斯等天文在这里研究自从艾德温哈勃以来让宇费尽心思问题。

But even without being able to see the universe in those first instants, cosmologists are pretty sure about a few things.

但是即使不能在最初瞬间看到宇，宇也相当确定一些事情。