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Published online 8 December 2004 | Nature | doi:10.1038/news041206-7
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Chilly Quaoar had a warmer past
Crystalline ice suggests remote object has radioactive interior.
Ice crystals have been discovered on Quaoar, a mysterious object in the outer reaches of the Solar System. The discovery suggests that Quaoar and many similar objects could be much warmer and more geologically active than had been thought.
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