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On the Fringe

Astronomers look to the Kuiper belt  for clues to the solar system’s history

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2:39pm, December 31, 2009

Beyond Neptune lies a reservoir of rejects — icy debris left to roam the solar system’s dim outer limits having never coalesced into planets. But these frozen relics preserve a trove of clues about the earliest history and architecture of the solar system, astronomers are discovering.

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