或者，膨胀可能是宇宙冷融合的一个结果。

Or it could be a case of cosmological cold fusion.

youdao

它又冷又硬，在他漆黑一团的宇宙中它什么也不象。

It was cold and hard, and like nothing else in his black universe.

youdao

就像这样，通过观察氢原子，我们能够知道宇宙中暗物质有多冷，也即指示暗物质的温度。

So just like that, from looking at hydrogen, we can tell how cold our Universe's dark matter has to be. And that's how hydrogen teaches us the temperature of dark matter!

youdao