Description
太阳系有八大行星,人类赖以生存的地球就是其中之一,上个世纪三十年代,冥王星被确立为太阳系第九大行星,相关概念也得到了人们的认可。然而随着研究的不断深入,人们渐渐认识到其他行星与冥王星存在一定的差异,由此推出行星的划分标准,于是冥王星被归为矮行星。
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