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Space Rocks' Demo Job: Asteroids, not comets, pummeled early Earth

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9:52am, March 6, 2002

It's no secret that the inner solar system took a beating from swarms of speeding objects soon after the planets and moons formed. What's been uncertain is the nature of those extraterrestrial bullets. A new analysis of meteorites suggests that it was asteroids rather than comets that rained hell on Earth about 3.9 billion years ago.

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