Meteors more massive than the dinosaur-killing asteroid struck Earth 800 million years ago

About 800 million years ago, a flurry of small asteroids slammed into the moon, pocking the lunar surface with clusters of craters. But the moon wasn’t the only victim of this cosmic bombardment.

If the moon experienced multiple asteroid strikes during this time, its close neighbor and parent planet — Earth — was probably also scarred by the same cosmic “storm,” even if time has long since erased all traces of those ancient impacts. And that massive bombardment may have turned Earth into a giant snowball, researchers reported in a new study.

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