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？
Our planet Earth, together with other planets, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto revolve around our Sun in what is called our Solar system.
我们的地球和其他行星——水星、金星、火星、木星、土星、天王星、海王星、冥王星一起围绕着太阳旋转，构成所谓的太阳系。
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，太阳系的四个重量级。但曾经存在第五个行星吗？
That's when the two brightest planets in our own solar system, Venus and Jupiter, will almost unite. Uranus and Neptune will be shining green but will need a good binocular to be seen.
到那时我们太阳系最亮的两颗行星——金星和木星将密切会合，天王星和海王星将发出绿光，不过需要一架好的双筒望远镜才能看到。
Voyager 2 is the only spacecraft that has flown close by to one of the more enigmatic planets in our solar system: Uranus.
旅行者2号是唯一一个接近我们太阳系众多神秘行星之一天王星的一艘航天器。
The second asteroid belt lies at about 20 astronomical units from the star, or a position comparable to Uranus in our solar system.
第二个行星带距离它的恒星为20个天文单位，这相当于太阳系中天王星的位置。
You guessed it; the best helium-3 supply in the solar system is from the "Gas Mines" of Uranus.
你猜对了，在太阳系以内最好的氦-3供应来自天王星的“天然气田”。
As indicated in the graphic, the gas giant planets of our solar system - Jupiter, Saturn, Uranus and Neptune - are mostly composed of hydrogen. Image courtesy of NASA.
如图所示，我们太阳系中的气态巨行星——木星、土星、天王星、海王星——大部分是由氢构成的。图片来自。
The planets of our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
我们太阳系的行星有水星、金星、地球、火星、木星、土星、天王星和海王星。
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。
People had a further understanding of the Solar System when Herschel discovered Uranus in 1781.
1781年，赫歇耳发现了天王星，使人类对太阳系有进一步的认识。
Some think it's because a large body crashed into Uranus during the formative years of the solar system.
有人认为是在太阳系形成初期，天王星受到一个特大星体的碰撞导致的。
Uranus is another water-based planet that froze in the falls of your solar system.
天王星是在你们太阳系的下跌中冷冻起来的另一个水态行星。
The eight planets of the Solar System are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
太阳系八大行星分别是：水星、金星、地球、火星、木星、土星、天王星和海王星。
The planets of our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
这八颗经典行星分别是：水星、金星、火星、木星、土星、天王星和海王星。
Uranus is the only planet in our solar system with its rotational axis tilted over sideways.
天王星是太阳系中唯一一个绕其旋转轴运转的行星。
SUGIZO: Miranda is a satellite of Uranus, you know the solar system?
Mirandan是天王星的卫星，你瞭解太阳系吧？
The planets of our solar system are Mercury, Venus , Earth, Mars , Jupiter, Saturn, Uranus, Neptune and Pluto.
我们生活的太阳系里的行星有水星、金星、地球、火星、木星、土星、天王星、海王星、冥王星。
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。
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。
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