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。
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.
因此，木星行星通常被称为巨行星。
彗星在组成上与气态巨行星相似。
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.
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.
之外是是四颗气态巨行星——木星、土星、天王星和海王星。
After that are four gas giants - Jupiter, Saturn, Uranus and Neptune.
正如在我们的太阳系一样，恒星与其气态巨行星之间相隔甚远。
As in our solar system, vast distances stretch between these stars and their gas giants.
今天，从广泛的巨行星轨道可见光和红外光的直接检测正变得越来越可能。
Today, direct detection of the visible and infrared light from giant planets in wide orbits is becoming increasingly possible.
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.
气体巨行星是像木星或海王星一类包含大量的气体物质的大的行星。
A large planet, like Jupiter or Neptune, that is composed largely of gaseous material.
描述：1994年，休梅克·利维彗星碎片撞击气态巨行星木星。
Caption: Fragments of Comet Shoemaker-Levy slam into the gas giant Jupiter in 1994.
木星是“气态巨行星”中的巨人，其质量比第二大的土星大出两倍多。
Jupiter is the Titan among planets called the "gas giants," with more than three times the mass of Saturn, the next largest.
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.
带有行星的epsilonEridani是一颗巨行星，质量为木星的1.5倍。
The planet orbiting epsilon Eridani is a giant planet, with a mass about 1.5 times that of Jupiter.
氢是宇宙中分布最为广泛的元素，它是类似于木星和土星这样的巨行星主要的构成成分。
Hydrogen is the most abundant element in the universe and is a major component of giant planets such as Jupiter and Saturn.
结果，行星编录上尽是短周期气体巨行星，这些行星被它们的太阳烤得火亮火亮。
As a result, the catalogue of planets is filled with "hot Jupiters", huge bodies baking brightly in the light of their sun.
然而在外部区域，太阳风变得十分温和，使得由氢和氦构成气态巨行星得以存在。
The solar wind was much weaker in the outer regions, however, resulting in gas giants made up mostly of hydrogen and helium.
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.
肯定是因为大小，木星，土星，天王星和海王星都是气体巨行星，然而冥王星不是。
It's gotta be the size... Jupiter, Saturn and uh, Uranus and Neptune, their the gas giants, well Pluto isn't.
这个答案对于理解低质量恒星和巨行星的形成过程，以及它们之间的差异，至为关键。
The answer is crucial to understanding the processes at play in low-mass stars and giant planets and the differences between them.
雅文4号卫星是环绕气态巨行星雅文运行的丛林卫星。这个偏远的世界是银河历史上的焦点。
A remote world that became a focal point in galactic history, Yavin 4 is a jungle moon orbiting the gas giant of Yavin.
通过WFIRST太空望远镜（最近还在计划阶段），我们可以对遥远的游离巨行星进行更多的直接观察。
More direct observations of distant free-floating giant planets should be possible with a new space telescope called WFIRST, currently in the planning stage.
在冷却了一百亿年后，大型气态巨行星的半径将非常近似于木星，但质量越高，半径却会略微缩小。
After 10 billion years of cooling, large gas giants are all very nearly Jupiter's radius, but more massive objects are slightly smaller.
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.
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.
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