When they do our, universe will reach its final stage: Heat death.

这时候，我们的宇宙将达到其最后阶段：热寂。

Scientists call it the 'heat death'.

科学家称之为“热寂”。

I believe that the majority of heat deaths are preventable deaths.

我相信大多数热死是可以预防的。

Okay, so we've already covered the heat death and the big rip.

好的， 我们已经介绍了热寂和大撕裂。

The exact mechanisms of heat deaths are complex, but they boil down to two types.

热寂的确切机制很复杂，但可以归结为两种类型。

But there are scenarios for the end of the Universe that could occur sooner than the heat death, so the Universe is currently expanding.

但是有一些宇宙终结的场景可能比热寂更早发生，所以宇宙目前正在膨胀。