The early Earth contained abundant radioactive materials.

早期地球含有丰富的放射性物质。

youdao

We must imagine the early Earth as a mixture of rocky materials, metals, and trapped gases, subject to constant bombardment by smaller planetesimals and without much of an atmosphere.

我们必须想象早期的地球是岩石材料、金属和封闭气的混合物，受到较小的星子的持续轰击，没有多少大气。

youdao

Despite its color, Titan actually seemed to look a lot like the early Earth.

除开颜色不同以外，“泰坦”实际上似乎很像早期的地球。

youdao

"The early Earth could well have been seeded with the chemical building blocks you need for life to start, " said Dr. Smith.

WSJ: Russia Meteor Was Largest in More Than a Century

It has long been thought that the lunar body resulted from an impact between the early Earth and another planet-sized object 4.5 billion years ago.

BBC: Moon formation: New spins put on old questions

The third sub-question of how life managed to get going at all in the hostile arena of the early Earth, was neatly addressed by Charles Cockell, of Britain's Open University.

ECONOMIST: The origin of life