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pluto not a planet, astronomers rule
Author(s): 
Pages: 2-5
Year: Issue:  1
Journal: EST Learning

Abstract: 除了环绕太阳运转,一颗成熟的行星必须大得足以因自身引力而变得足够的圆,并且能够支配其轨道附近的左邻右舍。这项新的规定使冥王星失去了太阳系行星的身份。
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