These rocky planets are called "Terrestrial Planets".
这些岩态行星被称为“类地行星”。
By comparison, the terrestrial planets have meager atmospheres at best.
相比之下，类地行星最多只有稀薄的大气层。
However, unlike Jupiter, the terrestrial planets today are nearly void of light gases and ices.
然而，如今的类地行星与木星不同，几乎没有轻气体和冰。
The terrestrial planets are mostly rocks: dense rocky and metallic material, with minor amounts of gases.
类地行星主要是岩石：密度大的石块和金属物质，同时会有少量的气体。
These asteroids are like the terrestrial planets, in that they're composed mostly of rocky material and metals.
这些小行星像类地行星一样，主要由岩石物质和金属构成。
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.
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。
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.
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。
In this, mercury differs from the other terrestrial planets.
在这方面，汞不同于其他类地行星。
Mercury, Venus, Earth, and Mars are sometimes called the terrestrial planets.
水星、金星、地球和火星通常被称为陆地行星。
"They migrate right through where terrestrial planets would be forming," Raymond says.
雷蒙德说道：“它们的迁移会径直穿过类地行星形成的地方。”
Forged by the Milky Way's abundant stars, such heavy elements are the building blocks of terrestrial planets.
这些由银河系众多恒星锻造出的重元素正是类地行星的构建模块。
The surface of Mercury occupies a fairly unique location on the diagram for the surfaces of terrestrial planets.
水星表面与其他的类地行星的表面很不一样。
This could be the way terrestrial planets evolve and the Moon is begging us to go back and explore to figure that out.
这可能是类地行星的演化方式，月球正在期待我们回去探索，让真相水落石出”。
It's believed that in addition to Earth, the terrestrial planets Mars and Venus may have had oceans soon after their formation.
相信除了地球之外，类地行星火星和金星在它们形成后不久可能就有海洋的形成。
Scientists say further study is needed to determine whether these rocky, terrestrial planets could support any life forms.
科学家表示，还需要进一步的研究以确定这些岩态陆地行星是否存在任何形式的生命。
Those ideas about terrestrial planet formation and habitability of terrestrial planets will need to be re-evaluated from scratch.
那些关于类地行星形成与类地行星可居住性的概念将需要从头开始重新进行评估。
The common depletion of volatile elements in terrestrial planets was probably caused by the early violent activities of the inner solar nebula.
类地行星挥发性元素普遍亏损很可能是由于太阳星云早期剧烈的太阳活动引起的。
Understanding how the moon formed provides a window into what terrestrial planets, including Earth, were like shortly after they formed, Zuber added.
了解月球的形成为探索包括地球在内类地行星在形成后的面貌打开了一扇窗，Zuber补充道。
Another new discovery concerns Mercury's magnetic field. The planet, along with Earth, is alone among the terrestrial planets in having a global magnetic field.
另一个新发现是关于水星磁场的：水星和地球是所有的类地行星中有球星磁场的行星。
Most models of planets assume that they are similar to the terrestrial planets in our own Solar System, with about half as much carbon as oxygen in the atmosphere.
而多数行星模型均假设它们和我们太阳系的类地行星相似，即在大气中碳含量是氧含量的一半左右。
One question that has baffled planetary scientists is how oceans formed on the surface of terrestrial planets like Earth — rocky planets made of silicate and metals.
一个困扰着行星科学家的问题是：海洋是怎样在像地球这样由硅酸盐和金属组成的石质行星的表面形成的？
Recently, scientist have also discovered comets in the main asteroid belt -these main-belt comets might be a key source of water for the inner terrestrial planets.
最近，科学家在主小行星带中也发现了一些彗星——这些主带彗星可能是类地内行星上水的关键来源。
ScienceDaily (Dec. 20, 2010) —Study suggests that trace amounts of water created oceans on Earth and other terrestrial planets, including those outside the solar system.
《每日科学杂志》(2010年12月20日)——研究表明微量的水创造了地球和其他类地行星上的海洋,包括那些在太阳系以外的类地行星。
Thee planet-hunting spacecraft went into orbit two years ago and a year later Laughlin decided to create price tags for the terrestrial planets that Keplar was set to discover.
两年前，美国宇航局的“开普勒”飞船进入轨道开始寻找类地行星。一年后，劳克林教授决定发明一种公式为“开普勒”发现的目标估价。
According to new observations, it can be proved quantitatively that a mode of eight major planets of the Solar System is a symmetrical structure: four terrestrial planets and the asteroid belt;
根据最新的观测结果，作者定量论证了太阳系的八大行星模式：它是对称的四个类地行星和小行星带；
The most obvious difference between the terrestrial and the Jovian planets is their size.
类地行星和类木行星之间最明显的区别是它们的大小。
The four planets nearest it are rocky, terrestrial worlds — Mercury, Venus, Earth and Mars.
最接近它的四颗行星是石质的类地行星——水星、金星、地球和火星。
If such planets exist, these missions-nasa's Terrestrial planet Finder and ESA's darwin-should be able to scan their atmospheres for the presence of gases that would indicate the existence of life.
如果真的有这类行星存在，NASA的类地行星搜寻者，以及ESA的达尔文计画等任务，将得以探测它们的大气，寻找象征生命存在的气体。
If such planets exist, these missions-nasa's Terrestrial planet Finder and ESA's darwin-should be able to scan their atmospheres for the presence of gases that would indicate the existence of life.
如果真的有这类行星存在，NASA的类地行星搜寻者，以及ESA的达尔文计画等任务，将得以探测它们的大气，寻找象征生命存在的气体。
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