Tiny dust particles collected from a comet and brought to earth last year now have scientists rethinking some of their beliefs about how comets--and the rest of our solar system--originally formed.

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Astronomers attending an international summit in Prague plan to vote next week on a new classification of Pluto-like objects that will redefine the solar system. Experts discuss the proposed solution to the long-standing debate over whether Pluto is a planet.

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