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？
Jupiter, Saturn, Uranus, and Neptune. Those are the gas giants, the four heavyweights of the solar system. But was there once a fifth?
它是巨型气体行星与我们找寻的目标之间的一颗过渡性星体。
This is a transitional planet somewhere between a gas giant and what we've been hoping to find.
除新发现的这颗行星之外，还有两颗巨大的气体行星围绕着它运转。
In addition to the newly found planet the star has two large gas planets around it.
大一点的是气体行星，它们的硬质表面深埋在氢氦层低。
Larger worlds are gassy, with their solid surfaces buried beneath deep blankets of hydrogen and helium.
它肯定不是像木星一样的巨型气体行星，也不适宜人类居住——那太热了。
It's definitely not a gas giant like Jupiter. Nor is it habitable—it's too hot.
他远离漂泊的生活，定居在气体行星贝斯平的飘浮都市云城里。
He distanced himself from the life on the run, and settled down in the floating metropolis of Cloud City, on the gas planet Bespin.
就像比它更大的邻居-木星一样，土星也是气体行星，主要由氢和氦所组成。
Like its bigger neighbor Jupiter, Saturn is a gas planet made mostly of hydrogen and helium.
他们认为，任何年轻的类地行星都会在巨型气体行星向内迁移时被毁灭掉。
Any young Earth-like planet, they thought, would be obliterated by the gas giant as it marched inwards.
一开始的气体行星演化为贝斯平，这个当地的外星居民则进化为乌格瑙特人。
As the primordial Gas Planet evolved into Bespin, so too did its native alien inhabitants evolve into the Ugnaughts.
举个例子，人们发现一颗被称为HD 209458b的巨大的气体行星含有氧、碳和水。
As one example, a gas giant planet called HD 209458b has been found to contain oxygen, carbon and water.
计算机模拟表明，要演变成我们目前的太阳系，最初的形式可能存在第五个巨大的气体行星。
To evolve into our current solar system, the original version probably had a fifth gas giant, computer simulations indicate.
另一个模型——碎化模型则认为大量聚集的气体盘在10000多年间直接形成了气体行星。
The other model, 'fragmentation', suggests that small clumps of a gaseous disk form directly into planets over 10, 000 years.
另一个模型——碎化模型则认为大量聚集的气体盘在10000多年间直接形成了气体行星。
The other model, 'fragmentation', suggests that small clumps of a gaseous disk form directly into planets over 10,000 years.
行星升起：在艺术家的想像图中，在一个遥远的行星系统内，一颗岩石卫星围绕一颗气体行星旋转。
PLANETRISE: In an artist's conception, rocky moons orbit a gas giant in a distant planetary system.
如果一个原行星足够大，形成足够快，它的重力会拉入星云的气体，它就会变成一个巨型气体行星。
If a protoplanet was large enough, soon enough, its gravity would pull in the nebular gas, and it would become a gas giant.
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？
Jupiter, Saturn, Uranus and Neptune. Those are the gas giants, the four heavyweights of the solar system. But was there once a fifth?
而且，如果他们真是混合体，那么成为巨型地球的岩石行星和迷你海王星的气体行星之间的界限在哪？
And, if they are a mixture, where is the boundary between the rocky ones, known as super-Earths, and the gaseous ones, known as mini-Neptunes?
首先被发现的行星们是巨大的气体行星，它们像木星一样大部分由氢构成，其运行轨道距围绕的恒星很近。
The first were huge gas planets — composed mostly of hydrogen, similar to Jupiter — that orbited extremely close to their stars.
设计的存在使核动力的喷气机无限期地在这个巨大的气体行星的大气层内飞行-这可以证明保持一个悬在高处的提炼工厂的可行的方法。
Designs exist for nuclear powered ramjets that could fly indefinitely in the atmospheres of the gas giants — this might prove a viable means of keeping an extraction factory aloft.
尽管目前研究人员还没有直接证据证明这是一颗岩状行星，但是他们宣称，这颗行星的质量表明，它并不是一颗类似木星的巨大气体行星。
Though the researchers have no direct proof that the new planet is rocky, its mass means it is not a giant gas planet like Jupiter, they said.
但这些气体行星上的暴风雨，一般发生在其大气的深处，所以他们的反物质的粒子束可能无法逃脱这些行星而进入太空，他补充说。
But the storms on those gas giants generally occur deeper in their atmospheres, so their antimatter beams may not be able to escape into space, he added.
表面重力，这个气体巨人的大气层的气压水平限制在一巴范围，是地球的百分之90的并且需要达到的低轨道的速度是所有的气体行星的最低水平。
The surface gravity, which is defined from the 1 bar pressure level in a gas giant's atmosphere, is 90 percent that of Earth's and the speed needed to reach low orbit is lowest of all the gas planets.
发现这颗行星同样一组天文学家早些时候也发现另一颗行星，该行星同海王星类似，是一颗巨大的气体行星，围绕恒星运转的周期为5.4天。
The same team of astronomers who discovered it had earlier found another planet, this time a gaseous giant similar to Neptune, orbiting the same star every 5.4 days.
大部分这些行星的体积比原本体积较大的土星还要大，这使得它们都不太适宜人类居住——因为这些体积巨大的行星往往都是气体行星，像土星一样没有可供行走的固态表面。
Most of those planets are more massive than Saturn, which makes them unpromising from a habitability standpoint-such giants tend to be gaseous bodies without a surface to walk on.
科学家们观测到了“赛吉奥”的晃动，这些晃动来自于一个类似木星大小的气体行星的巨大引力作用，此行星被科学家们戏称为“小赛吉奥”[iau名：hip 13044b]。
The scientists saw Sergio wobbling due to the gravitational tug of a Jupiter-sized gas planet, which the scientists dubbed Sergio Junior [IAU name: HIP 13044 b].
这些可能正在使行星变暖的气体，其重要影响将在许多年之后显现。
The gases that may be warming the planet will have their main effect many years hence.
据推测，所有行星都是由尘埃和气体组成的原始云团凝聚而成，其组成与木星的组成有些相似。
It is hypothesized that the primordial cloud of dust and gas from which all the planets are thought to have condensed had a composition somewhat similar to that of Jupiter.
这两组行星的构成物质根据熔点分为三类：气体、岩石和冰。
The substances that make up both groups of planets are divided into three groups—gases, rocks, and ices—based on their melting points.
这两组行星的构成物质根据熔点分为三类：气体、岩石和冰。
The substances that make up both groups of planets are divided into three groups—gases, rocks, and ices—based on their melting points.
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