The cloud grows because more of those water droplets are condensing out of the air.

云变大是因为有更多空气中的水滴凝结在了一起。

But why does water condense out of air and become visible as a cloud?

那为什么水能从空气中凝结而成为可见的云呢？

They're made of relatively light carbon compounds that can be condensed out of natural gas by cooling it.

它们是由相对来说更轻的碳化合物构成的，可以通过冷却天然气浓缩而成。

In others, they're just cool enough that iron condenses out of the atmosphere… which means it literally rains molten iron!

而另一些，它们的温度足够低，铁就会从大气中凝结出来… … 这就意味着它会像下雨降雨熔铁！

Then, the dust settles; minerals condense out of the gas.

然后，尘埃落定；矿物质从气体中凝结出来。

So the liquid that condenses out on the other side will be clean freshwater.

所以在另一边凝结出来的液体就是干净的淡水。

These are very primitive, and are thought to have condensed out of the original disk of material that formed the solar system.

它们都是非常原始的，人们认为它们是从形成太阳系的原始盘状物质中浓缩出来的。

This is the same process that forms clouds - millions of tiny water droplets condensing out of the air to form liquid water.

这和云彩的形成过程相同-空气中数以百万计的水滴遇冷凝结成液态水。

Actually what we call dry ice is frozen carbon dioxide. The atmosphere is very thin and it's nearly all carbon dioxide, so when it gets very cold what condenses out is carbon dioxide snow, carbon dioxide ice.

事实上我们叫做干冰的是冻结的二氧化碳。大气层非常稀薄，几乎都是二氧化碳，所以在它变得非常寒冷的情况下结晶出来的是二氧化碳的雪，二氧化碳的冰。