求教一个关于火星的问题(英文题)

因为它的体积太小，因而很快冷却了。

需要英文答案吗？

The planet is so small that it's core had been cool in billions years ago.

Earth still has a liquid core, whereas the smaller Mars, having cooled faster, could be completely solid today.（地球地心仍然存有熔岩，然而火星因为体积较小，散热比较快速，所以地心可能已冷却成为固体。）

搞英文干嘛啊，不想去翻译勒