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。
It is an easily provable fact that with only chemical rockets, our ability to explore the outer planets and their moons is hindered.
如果仅仅使用化学燃料火箭，我们探索外层空间行星及其卫星的能力将受到限制，这是不难证明的事实。
The outer planets are giant worlds with thick outer layers of gas.
外行星是具有气体外层的巨大行星。
The outer planets are giant worlds with thick outer layers of gas.
外行星是具有气体外层的巨大行星。
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