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Comet Sampler: Specimens show that inner and outer solar system mixed

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10:24am, December 13, 2006

Just as the solar system was forming some 4.6 billion years ago, it turned itself inside out. Some of the hottest material, residing so close to the sun that it almost vaporized, sped out to the chilliest reaches of deep space. These bits of formerly high-temperature dust ultimately became parts of the icy balls known as comets.

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