From studying Earth we know anorthosite forms in a very special way.

通过研究地球，我们知道斜长岩以一种非常特殊的方式形成。

Anorthosites like the Genesis Rock turn out to be the oldest rocks on the moon.

像创世岩这样的斜长岩是月球上最古老的岩石。

Why would there be anorthosite on the moon?

为什么月球上会有斜长石？

As magma cools and crystallizes, anorthosite floats to the top, because it's lighter and less dense than other stuff in the magma.

随着岩浆冷却和结晶，斜长岩漂浮到顶部，因为它比岩浆中的其他物质更轻、密度更小。

And if the highlands–which cover most of the moon–were anorthosite, that meant most of the moon was covered in that white rock elementary.

如果覆盖大部分月球的高地是斜长岩，这意味着大部分月球被白色岩石基本覆盖。

And if the highlands–which cover most of the moon–were anorthosite, that meant most of the moon was covered in that white rock… elementary.

如果覆盖大部分月球的高地是斜长岩，那就意味着大部分月球都被那块白色岩石覆盖… … 基本。

And that became a really important sample because as people looked through it, they found little fragments of white rock and they're like, oh, it's anorthosite.

这成了一个非常重要的样本，因为当人们查看它时，他们发现了白色岩石的小碎片，他们就像，哦，这是斜长岩。

And a geologist named John Wood, at the Smithsonian, noticed white flecks of rock in the soil… which he identified as a rock type called anorthosite.

史密森尼学会 (Smithsonian) 的一位名叫约翰·伍德 (John Wood) 的地质学家注意到土壤中有白色的岩石斑点… … 他将其确定为一种称为斜长岩的岩石类型。

So you have rock bergs floating in an ocean of magma and eventually you have nothing but rock bergs and the entire surface is covered with this anorthosite.

所以你会看到岩山漂浮在岩浆的海洋中，最终除了岩山什么也没有，整个表面都被斜长岩覆盖。

To make anorthosite the main rock from the moon, be this white anorthosite, you need to have a global ocean of magma that covers the entire moon, that's hundreds if not thousands of kilometres thick.

为了使斜长岩成为月球上的主要岩石，如果是这种白色的斜长岩，你需要有覆盖整个月球的全球岩浆海洋，那有数百甚至数千公里厚。