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Science Briefing

Icy rocks may be from Kuiper belt

July 18, 2009|Times Wire Reports

A new theory says the solar system's main asteroid belt is littered with icy invaders -- asteroids that seem more like primitive frozen comets than the baked rocks that make up a large majority of asteroids between Mars and Jupiter.

A theory proposed by scientists in the journal Nature suggests the icy rocks are "contamination" from the Kuiper asteroid belt beyond Neptune.

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