Ancient Asteroid It happened 3.4 billion years ago, and was maybe 1,000 times the size of the one that wiped out the dinosaurs. Scientists writing in Science this week suggest that the early earth may have been hit hard by the meteor and that life had to start all over again. NPR's Christopher Joyce reports.

Ancient Asteroid

Ancient Asteroid

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It happened 3.4 billion years ago, and was maybe 1,000 times the size of the one that wiped out the dinosaurs. Scientists writing in Science this week suggest that the early earth may have been hit hard by the meteor and that life had to start all over again. NPR's Christopher Joyce reports.