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New look for comets A new class of comets that orbit within the main asteroid belt, between Mars and Jupiter, could have provided Earth with its present-day water say two astronomers in the US. Henry Hsieh and David Jewitt of the University of Hawaii have observed three objects in the asteroid belt which have the "dusty tails" characteristic of icy comets (Sciencexpress 1125150).
Comets are "undercooked leftovers" that remained after clouds of dust and gas condensed to form the Sun and planets some 4.
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