Third, the gravitational shield of the giant outer planets, while highly efficient, must occasionally fail to protect Earth.
第三，巨大的外行星的引力屏障虽然非常有效，但偶尔也会无法保护地球。
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 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。
NASA calls this a gravity assist, and exploits it to save fuel in missions to outer planets such as Jupiter and Saturn.
美国航空航天局称这是一个重力辅助，并利用它来节省执行去木星和土星等外行星的任务时消耗的燃料。
All four outer planets probably have cores of metals, silicates and water.
这四颗外层行星的内核可能都是由金属、硅酸盐和水构成。
Perturbations up to the sixth order obtained by an iterative method complete the theory of the four outer planets.
由迭代算法得到的直到六阶的摄动补充完整了远日的四个行星的理论。
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。
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。
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