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1·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.

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。

2·She's also interested in determining what conditions other than a liquid ocean might help initiate life on a terrestrial planet.

她也有兴趣找出什么样的环境比陆地行星上的液体海洋更能有助于产生生命。

3·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。

4·And the Terrestrial Planet Finder, an even more ambitious project that might have been able to study alien atmospheres, has been postponed indefinitely.

而作为将可能具有研究外星大气功能的更具雄心的项目，“类地行星搜索者”已被无限期延期。

5·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。

6·The finding contradicts the prevailing notion that a terrestrial planet needs a large moon to stabilize the orientation of its axis and, hence, its climate.

该发现跟一种流行的观念相抵触，这种观念认为类地行星需要一颗巨大的卫星来稳定行星轴的方向性，进而稳定其气候。

7·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。

8·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。

9·Being terrestrial creatures, humans got used to see and perceive the surroundings from the surface of the Planet.

作为陆地生物，人类习惯于观看和感知地表周围的事物。

10·So if life does emerge readily under terrestrial conditions, then perhaps it formed many times on our home planet.

所以如果生命确实可以毫无困难地在陆地环境中生活，那么也许生命曾在地球上形成过多次。