| 释义 |
〔Pluto〕The ninth and usually farthest planet from the sun, having a sidereal period of revolution about the sun of 248.4 years, 4.5 billion kilometers or 2.8 billion miles distant at perihelion and 7.4 billion kilometers or 4.6 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 |