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太阳系“9大行星”自2006年起，被国际天文学会改为“8大行星”。美国太空总署（NASA）署长布里登斯廷近日对此公开表态，坚称冥王星是一颗行星，而非矮行星，被视为挑战近年学术界的主流共识。

2017年获总统特朗普任命为NASA署长的布里登斯廷曾为海军飞行员，并非太空专家，他在科罗拉多州出席一场机械人比赛时提到，冥王星是一颗行星。

他其后再在社交网重申，自小就学习冥王星是9大行星之一，将会继续捍卫有关看法。

国际天文联合会于2006年更新行星定义，当中包括轨道必须环绕太阳、有足够质量维持流体静力平衡、清除邻近轨道的天体等。冥王星因不符合上述条件，因而被降格为矮行星。