类地行星和类木行星之间最明显的区别是它们的大小。
The most obvious difference between the terrestrial and the Jovian planets is their size.
同样，由于它们的相对位置，四颗类木行星被称为外行星，而类地行星被称为内行星。
Also, because of their relative locations, the four Jovian planets are known as the outer planets, while the terrestrial planets are known as the inner planets.
类地行星的密度的平均值大约是水的密度的五倍，而类木行星的密度平均值只有水的密度的1.5倍。
The densities of the terrestrial planets average about 5 times the density of water, whereas the Jovian planets have densities that average only 1.5 times the density of water.
最大的类地行星地球的直径仅仅是最小的类木行星海王星的四分之一，而且地球的质量仅仅是其质量的十七分之一。
The largest terrestrial planet, Earth has a diameter only one quarter as great as the diameter of the smallest Jovian planet, Neptune, and its mass is only one seventeenth as great.
四类木行星木星、星、王星和海王星。
The four huge gas planets are Jupiter, Saturn, Uranus and Neptune.
为什么类木行星有环？
天文学家对水星感兴趣是因为它是类地行星而非类木行星。
Astronomers are interested in Mercury, the closest planet to the sun, because it is a terrestrial like Earth, not gassy like Jupiter.
类地行星是水星、星、球和火星。四类木行星木星、星、王星和海王星。
The smaller Rocky worlds are Mercury, Venus, Earth and Mars. The four huge gas planets are Jupiter, Saturn, Uranus and Neptune.
类地行星是水星、星、球和火星。 四类木行星木星、星、王星和海王星。
The classical planets are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
它可能代表了一类新的“失败之星”，即介于恒星和类木行星之间的一种星体。
It may represent a new class of failed stars straddling the division between stars and Jupiter-like planets.
这种情形下，类木行星的形成就只需要几千年的时间，远在天体物质被星系抛射出去。
In this case, the formation of Jupiter-mass worlds may only take a few thousand years to form, well before the planet-building materials are ejected from the system.
被发现的多属于类木的气体巨星，甚至是贴近母恒星的热木类行星，寻找类地的系外行星是未来搜索的重点。
Most of them are Jupiter-like gas giants, or even Hot Jupiters that orbit their parent star too closely. Earth-like planets searches will become the main target in the future.
被发现的多属于类木的气体巨星，甚至是贴近母恒星的热木类行星，寻找类地的系外行星是未来搜索的重点。
Most of them are Jupiter-like gas giants, or even Hot Jupiters that orbit their parent star too closely. Earth-like planets searches will become the main target in the future.
应用推荐