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太阳系九大行星之一，按离太阳由近而远的次序计为第九颗，绕太阳公转周期约为248年，自转周期约6.4天。是九大行星中最小的行星。

1. 太阳系九大行星之一。按距离太阳的次序计为第九颗。绕太阳公转周期约为248年。表面温度约为－220°C，是太阳系中最小的行星，有一颗卫星绕它运转。

• It is only half the size of Pluto, which some astronomers have come to believe should not have been designated a planet at all.

  他的大小只有冥王星的一半，有些天文学家已经开始认为冥王星根本不应该被划分为行星。

• Perhaps Pluto is only the first of many similar objects orbiting in the darkness far beyond the sun.

  也许冥王星只是在离太阳很远的一片黑暗中沿轨道运行的许多类似天体中的第一个。

• For one , KBO and pluto are made of the same stuff, namely rock and ice. And for most of it's orbit, pluto is in the keper belt.

  一方面他们都有同样的东西组成我们叫它岩石冰，另一方面冥王星的大多数的轨道也是K带。

• This has got to be be one of the most heartbreaking questions I get asked, "Why Isn't Pluto a Planet" .

  “为什么冥王星不是行星”，这肯定是我被问到的最令人无奈的问题之一。

• s status as a planet, the classical theory of nine planets in the solar system would have had to be changed, but the other way around.

  由此看来，即使国际天文学联合会保住冥王星的行星地位，经典的太阳系九大行星理论也仍然要改，只是改法相反而已。

• This new moon is tied up with the positive energies between Pluto and the sun that are about to end in a couple of days.

  这次的新月是和冥王星与太阳的积极力量相伴的，这股力量在不久之后就要消失了。

• Pluto, Eris and the many other Kuiper Belt objects are far too different to be lumped in with the eight official planets, he said.

  冥王星、厄里斯和许多其他柯伊伯带的天体对于八大行星来说太不同了，无法归为一类，他说。

• Pluto is usually considered to be a planet, and Xena has unofficially been called a planet.

  冥王星通常是认定为行星，而齐娜则是非正式的行星。

• A giant underground ocean could exist as well, and clues to its presence could be inferred by the geology or chemistry of Pluto's surface.

  从冥王星地表地质及化学分析可以推测其地底可能存在大片海洋。