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1·Scientists laboured for months to unravel the mysteries of Neptune and still remain baffled.

科学家们为揭开海王星之谜艰难地工作了数月，但依然迷惑不解。《柯林斯英汉双解大词典》

2·The large amount of methane contained in the atmosphere surrounding Neptune stained it blue.

围绕海王星的气层内所含大量甲烷将它染成了蓝色。

3·After that, Jupiter and Neptune will not meet again until 2022, but when they do meet then, it will not be in Aquarius.

在那之后，木星和海王星直到2022年才会再次相遇，但是当他们相遇的时候，将不在水瓶座。

4·Jupiter, Saturn, Uranus, and Neptune. Those are the gas giants, the four heavyweights of the solar system. But was there once a fifth?

木星、土星、天王星和海王星。这些都是气体行星，是太阳系的四个重量级。但曾经存在第五个行星吗？

5·Moving on through the asteroid belt we enter the realms of the gas giant planets: Jupiter, Saturn, Uranus, and Neptune, all of which dwarf the Earth.

穿过小行星带继续前进，我们进入了气体巨行星区域：木星、土星、天王星、海王星，所有这些都使地球看起来像个侏儒。

6·The largest terrestrial planet, Earth has a diameter only one quarter as great as the diameter of the smallest Jovian planet, Neptune, and its mass is only one seventeenth as great.

最大的类地行星地球的直径仅仅是最小的类木行星海王星的四分之一，而且地球的质量仅仅是其质量的十七分之一。

7·Now Neptune faces competition from the Stratollite, a balloon being developed by a company called World View Enterprises.

现在海王星号面临着来自平流卫星的竞争，平流卫星是一家名为世界视野的公司开发的气球。

8·The plan will be for spacemen and up to eight passengers to travel in Neptune, a capsule tied to a balloon about the size of a football field.

该计划将让宇航员和最多8名乘客乘坐海王星号旅行，海王星号是一个绑在足球场大小的气球上的太空舱。

9·The planets, in order of their distance from the Sun, are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.

按照它们与太阳的距离排列，这些行星分别是水星、金星、地球、火星、木星、土星、天王星、海王星和冥王星。

10·Jupiter, Saturn, Uranus and Neptune.

木星，土星，天王星和海王星。