Bu IAU komitesinin 2006 kararından dolayı 12 oluyrmuş:
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The matter of the lower limit was addressed during the 2006 meeting of the IAU's General Assembly. After much debate and one failed proposal, the assembly voted to pass a resolution that defined planets within the Solar System
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2009 da yeni değerlendirme yapılmış:
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The next IAU conference is not until 2009, when modifications could be made to the IAU definition, also possibly including extrasolar planets
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bu tarife göre ise 13 gezegen var :
http://en.wikipedia.org/wiki/Planet
ama temel yine 8 gezegen (pluto artık gezegen sayılmıyor)