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【多选题】
2006年8月24日, 在捷克首都布拉格召开的“国际天文学联合会大会”上做出了一个不同寻常的结论：位居太阳系九大行星末席70多年的冥王星，被正式降为太阳系的二级行星——矮行星。从此，太阳系除太阳以外的其他成员被确定为三大族群，该三大族群的名称分别是（ ）。A.
八大行星
B.
矮行星
C.
太阳系小天体
D.
彗星
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