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Early Meteorite Bits Reveal Clues About Solar System's Evolution
Many meteorites found on Earth are remnants of one titanic solar-system collision that took place more than 460 million years ago. But for the first time, researchers have specifically targeted meteorites that fell to Earth just before that asteroid collision and found that the composition of those earlier space rocks is quite different than those today.
http://www.space.com/35413-early-mic...evolution.html
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