The common depletion of volatile elements in terrestrial planets was probably caused by the early violent activities of the inner solar nebula.
類地行星揮發(fā)性元素普遍虧損很可能是由于太陽星云早期劇烈的太陽活動引起的。
The only satellite of Pluto.
卡戎冥王星的唯一衛(wèi)星
It is all because, compared with Neptune, Pluto is very small.
而和海王星比起來，冥王星體積又太小。
In that way, Pluto acts like a comet.
也就是說，冥王星的行為像一個彗星。
One was a decision to name Pluto are a * dwarf Planet.
一個是冥王星被命名為“矮行星”。
Pluto is the ninth planet in our solar system and the furthest from the sun
冥王星是離太陽最遠(yuǎn)的第九顆行星。
It takes Pluto 248 Earth years to spin around the Sun.
冥王星離太陽最遠(yuǎn).冥王星需花248地球年繞太陽運行一周.
Yet there are differences between Pluto and the new object.
冥王星和新天體還是有區(qū)別的。
Pluto has an elliptic orbit.
冥王星的軌道是橢圓形的。
Astronomers are considering changing what they call Pluto.
天文學(xué)家正考慮更改冥王星的名字。
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觀測
The planets of our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto.
我們太陽系的行星有水星、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.
天文學(xué)家不再肯定冥王星應(yīng)該被視為行星。
It is the least dense planet, except possibly for Pluto.
也許除了冥王星外，它是密度最小的行星了。
The opposition between Mars and Pluto shows a defiant attitude.
火星與冥王星之間的對分相顯示出反抗的態(tài)度。
Pluto has a moon, called Charon, which is about the size of Quaoar itself.
冥王星有一顆衛(wèi)星，叫卡戎，和夸歐爾差不多大。
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，有些天文學(xué)家已經(jīng)開始認(rèn)為冥王星根本不應(yīng)該被劃分為行星。
Unfortunately, it has a special orbit which overlaps with Neptune's.
然而不幸的是，冥王星的軌道很特殊，與海王星是相交的。
The discoveries of Neptune in 1846 and of Puto in 1930 were made as the result of predictions.
1846年發(fā)現(xiàn)的海王星和1930年發(fā)現(xiàn)的冥王星，是預(yù)言的產(chǎn)物。