The common depletion of volatile elements in terrestrial planets was probably caused by the early violent activities of the inner solar nebula.
类地行星挥发性元素普遍亏损很可能是由于太阳星云早期剧烈的太阳活动引起的。
The only satellite of Pluto.
卡戎冥王星的唯一卫星
It is all because, compared with Neptune, Pluto is very small.
而和海王星比起来，冥王星体积又太小。
In that way, Pluto acts like a comet.
也就是说，冥王星的行为像一个彗星。
One was a decision to name Pluto are a * dwarf Planet.
一个是冥王星被命名为“矮行星”。
Pluto is the ninth planet in our solar system and the furthest from the sun
冥王星是离太阳最远的第九颗行星。
It takes Pluto 248 Earth years to spin around the Sun.
冥王星离太阳最远.冥王星需花248地球年绕太阳运行一周.
Yet there are differences between Pluto and the new object.
冥王星和新天体还是有区别的。
Pluto has an elliptic orbit.
冥王星的轨道是椭圆形的。
Astronomers are considering changing what they call Pluto.
天文学家正考虑更改冥王星的名字。
EINE EINZELNE FOTOGRAFISCHE HELLIGKEITSBESTIMMUNG DES PLANETEN PLUTO AM 12.6 MARZ 1956
1956年3月12.6日冥王星亮度的照相观测
The planets of our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.
我们太阳系的行星有水星、金星、地球、火星、木星、土星、天王星、海王星和冥王星。
Astronomers are no longer sure that Pluto should be considered a planet.
天文学家不再肯定冥王星应该被视为行星。
It is the least dense planet, except possibly for Pluto.
也许除了冥王星外，它是密度最小的行星了。
The opposition between Mars and Pluto shows a defiant attitude.
火星与冥王星之间的对分相显示出反抗的态度。
Pluto has a moon, called Charon, which is about the size of Quaoar itself.
冥王星有一颗卫星，叫卡戎，和夸欧尔差不多大。
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。
Unfortunately, it has a special orbit which overlaps with Neptune's.
然而不幸的是，冥王星的轨道很特殊，与海王星是相交的。
The discoveries of Neptune in 1846 and of Puto in 1930 were made as the result of predictions.
1846年发现的海王星和1930年发现的冥王星，是预言的产物。