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.
他们当中的许多都比气体巨行星木星还要大，不过天文学家还是发现了相当数目的和地球差不多大小的星体，其中的一些可能还适宜居住。
Many are bigger than the gas giant Jupiter, but astronomers have found an increasing number of worlds close to Earth's mass, some of which may be habitable.
因此，木星行星通常被称为巨行星。
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.
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.
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.
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.
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.
第一颗系外行星于1995年载入天文记录，到目前为止，天文学家们确认了515颗戏外行星的探测，其中大部分都是类似木星的巨行星。
The first exoplanet was catalogued in 1995 and astronomers have so far confirmed the detection of 515. Most are giant planets thought to resemble Jupiter.
此外，对木星的研究表明，外层的气态巨行星能充当盾牌的作用，保护内部岩态行星——和行星上的任何生命形态——免遭频繁光顾的小行星撞击。
What's more, studies of Jupiter suggest that outer gas giants can act as gravitational shields, protecting inner rocky worlds-and any life-forms on them-from frequent asteroid impacts.
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.
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.
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.
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.
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.
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.
旅行者1号于1977年发射升空，至今已经完成了探测木星和土星这两颗巨行星的初始任务，并且还在不断传回信息数据。
Launched in 1977, Voyager 1 has accomplished its initial goals of exploring the giant planets Jupiter and Saturn and is still sending back information.
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.
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.
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.
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