早期地球含有丰富的放射性物质。
绝大多数的专家都相信，月球是在一个巨大行星与早期地球碰撞过程中所产生的碎石组成的。
Most experts believe a huge impact early in Earth's history ejected material into space that became the moon.
是什么使得这项研究如此重要呢？那就是它们是建立在早期地球更一般的现实环境的基础之上。
What makes both studies so potentially important is that they're based on a more realistic picture of conditions on early earth.
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