The Terrestrial Planets的意思|示意

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。

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。

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。

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。

NASA probe of the three major goal is to detect the earth outside world, the three planets has an ambitious goal, search terrestrial planets.

美国宇航局三大探测目标就是探测地球之外的世界，这三大行星都有宏大的目标，搜索类地行星。

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。