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1.The ninth and usually farthest planet from the sun, having a sidereal period of revolution about the sun of248.4 years,4.5 billion kilometers or2.8 billion miles distant at perihelion and7.4 billion kilometers or4.6 billion miles at aphelion, and a diameter less than half that of Earth.
冥王星距离太阳第九远而且通常也是最远的一颗行星，它绕太阳运转的恒星年为2484年，在近日点时距太阳45亿公里或28亿英里，在远日点时距太阳74亿公里或46亿英里，其直径不到地球直径的一半收藏指正
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