Meteorites likely wiped out Earth’s earliest life

The biggest smashups would have boiled off oceans and obliterated life

By Thomas Sumner, 14:02 PM August 14, 2014

Repeatedly during its early history, Earth was bombarded by space rocks larger in diameter than the state of Utah. Such collisions likely killed off any emerging life on the planet’s surface — probably again and again. The last of these death rocks struck around 4.3 billion years ago. At least that’s the estimate that scientists propose in the July 31 Nature. This date offers an upper limit to how long our planet may have continuously sustained life.

Earth appears to be around 4.6 billion year...

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