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Nature 442, 724-725 (17 August 2006) | doi:10.1038/442724a; Published online 16 August 2006
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Planets are round. Will that do?
Jenny Hogan
Next week, by a simple show of hands at an astronomy meeting, Earth could go from being one of nine planets to one of twelve — with unknown numbers yet to be discovered.A seven-member panel appointed by the International Astronomical Union (IAU) has recommended a new definition of a planet: any body in orbit around a star that is not a star itself nor in orbit around a much larger planet, and that is massive enough for gravity to have squished it into an approximately spherical shape.
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