诸如火星和地球这样的类地行星主要由岩石和金属构成，而木星则是大型气态行星。
The terrestrial planets—like Mars and Earth—composed largely of rocks and metals, and the large gas giants, like Jupiter.
同时，斯比哲太空望远镜发现另外两颗气态行星的大气层极度缺水。
Spitzer, meanwhile, found a surprisinglack of water in the atmospheres of two other gas giants.
通过对它们质量的估计得知它们是岩石行星，而不是像木星那样的气态行星。
Estimates of their mass also indicate that they are rocky planets, rather than being gaseous like Jupiter.
最近的工作重点考查这一类型的星系：星系中具有类似木星一样的巨形气态行星。
The latest work focuses on a type of star system that contains gas giants known as hot Jupiters.
WASP - 12 b是一颗气态行星，大约是木星质量的1.5倍，体积的2倍。
WASP-12b is a gaseous planet, about 1.5 times the mass of Jupiter, and almost twice the size.
同我们太阳系的巨形气态行星不同，炽热的木星具有更靠近恒星的轨道。西恩·雷蒙德说。
Unlike gas giants in our solar system, hot Jupiters have orbits that swing tightly around their stars, says Sean Raymond, study co-author and astrophysicist at the University of Colorado in Boulder.
除了因为它是土星和木星那样的巨型气态行星以外，它运行的轨道有些时候和其母星非常靠近。
Not only is the planet a gas giant similar to Jupiter or Saturn, the planet follows an orbit that brings it very close to its parent star.
他们之所以认定它是一颗岩状行星，是因为它的质量仅为地球的五倍——与气态行星相比实在相去甚远。
The team think it is rocky because it weighs only five times asmuch as Earth—too little for a gas giant.
行星状星云，在历史上曾因他们像巨型气态行星而被命名，目前已知的是它很像我们太阳的恒星遗骸。
Planetary nebulae, historically named for their resemblance to gas-giant planets, are now known to be the remains of stars that once looked a lot like our sun.
由于地球和木星的公转轨道是椭圆的，同时地球的轨道周期快于木星，从我们的角度观察，就像“追上”了这颗巨型气态行星。
Due to the near-circular orbits of Earth and Jupiter, as Earth has a faster orbital period than Jupiter, from our point of view we will appear to "overtake" the gas giant.
地球大气层中的甲烷是由活体生物产生的，而木星或其他气态行星上的甲烷是由光与大气层中其他化学物质相互作用而产生的。
On Earth, atmospheric methane is generated by living organisms, but on Jupiter and other gas giants, methane is produced by light interacting with other chemicals in the atmosphere.
行星HD 189733b是比木星还大的气态行星。研究已证实，该行星大气层中含有钠、一氧化碳、二氧化碳、水蒸气和甲烷。
Studies of HD 189733b, a hot gas giant that is larger than Jupiter, have confirmed that its atmosphere contains sodium, carbon monoxide, carbon dioxide, water vapour and methane.
影片中：与我们的太阳非常相似的半人马座阿尔法甲发出淡黄色的光芒，光芒照耀下的是巨大的气态行星波吕斐摩斯和它的卫星——炎热的潘多拉。
In Avatar: the white-yellow glow of Alpha Centauri a, a star very similar to our Sun, illuminates the giant gaseous planet Polyphemus and its tropical moon Pandora.
“这还是在另一个星系中首次被确认的岩态星球，”天文学界ArtieHatzes如是告诉cnn，与之对比的是，像木星与土星一样的气态行星。
"This is the first confirmed rocky planet in another system," astronomer Artie Hatzes told CNN, contrasting the solid planet with gaseous ones like Jupiter and Saturn.
因此，天文学家认为MOA-192 b 不会像地球这样气候宜人，而是像海王星一样，是一个冰冷的气态行星。虽然要在这颗行星上安家太冷了，但是它给予我们希望，或许地球这样尺寸的较小行星还是挺多的。
And while the planet is likely too chilly to make a good home, it gives us hope that smaller, Earth-sized planets may be abundant.
彗星在组成上与气态巨行星相似。
就它们与恒星的距离而言，其石质行星核恐怕需要极其长的成型时间，以至于在星核能够俘获气体前周围的气态盘恐怕就已经消散殆尽了。
At their distances from the star, the rocky planetary core would have taken so long to form that the gaseous disk would have dissipated before the core could attract the gas.
这个名字源于18世纪，当时望远镜威力还不够强大，无法区分星云和气态巨行星。
The name originates from the 18th century, when telescopes weren't powerful enough to distinguish nebulae from gas giant planets.
一旦质量超过这个限度，就开始进入气态巨行星的行列了。
Once the mass goes beyond that point, you start to get into gas giant territory.
幸神星是太阳系奥尔特云内的一颗假设的气态巨行星的昵称。
Tyche is the nickname given to a hypothesized gas giant planet located in the Solar System's Oort cloud.
问题是，迄今观测到的大部分外部行星——气态巨行星，太靠近他们的起源恒星，不可能在那里诞生。
The problem is that most of the exoplanets detected to date, being gas giants, are too close to their stars to have been born there.
目前与恒星相伴的行星都是那场角力中的幸存者，并不能说明实际上有多少气态巨行星形成。
That's because planets bound to a parent star would only reflect the survivors, not how many gas giant planets actually formed.
它们中的大多数都是巨大的气态星体，但最近的研究找到了一些较小的行星。
Most of these are massive gaseous bodies, but the latest searches are turning up ever-smaller worlds.
它是颗气态大行星，也叫“欧西·里斯”星。它的运行轨迹过于接近其恒星，致使它的部分大气层被恒星吹起。
It's a gas giant planet also called Osiris, and it's orbiting so close to its star that some of its atmosphere gets blown away by the stellar wind.
我们正试图追踪行星从气态盘到尘埃盘到行星盘而形成的整个历史。
What we are trying to do is trace the entire history of planetary formation from a gaseous disc, into a debris disc, into a planetary disc.
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。
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.
这颗命名为WASP - 12b的系外行星是一颗类似于木星的巨大气态星球。
The exoplanet, called WASP-12b, is a gas giant, like Jupiter.
古尔德说，比如一些星系只拥有类似地球的行星而没有气态巨行星。
For instance, some systems could house only Earthlike planets and no gas giants, Gould said.
古尔德说，比如一些星系只拥有类似地球的行星而没有气态巨行星。
For instance, some systems could house only Earthlike planets and no gas giants, Gould said.
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