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。
We could have a base on the moon within 30 years, reach Mars in 50 years, and explore the moons of the outer planets in 200 years.
我们可以在三十年内建立在月基地，五十年后到达火星，200年后探索外行星的卫星。
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。
Mars is too dry and poor in oxygen, Venus far too hot, and so is Mercury, and the outer planets have temperatures near absolute zero and hydrogen-dominated atmospheres.
火星太干燥又缺氧，金星太热，水星也一样。除此之外，太阳系的其他行星的温度都接近绝对零度，并围绕着以氢气为主的大气层。
IN the summer of 1977 two American spacecraft were launched on what is arguably the grandest mission ever: the exploration of the outer planets of the solar system and the space that lies beyond.
1977年的夏天，两位美国飞行员被选中投身于可以说是有史以来最伟大的使命：对太阳系及更远空间的外太空探索。
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。
Observations from NASA's Spitzer Space Telescope show that the system hosts two asteroid belts, in addition to previously identified candidate planets and an outer comet ring.
斯比策空间望远镜的观测显示，这个行星系统控制着两条小行星带，比上次我们确定的多了一条。
Pluto is one of the three outer transpersonal planets, and like Neptune and Uranus has a long cycle, so it takes many years to traverse a sign.
冥王星是三个超个人行星之一，并且就像海王星和天王星一样有着很长的公转周期，这就需要很多年去通过一个星座。
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。
Another effect of the first gas giant is that its gravity tends to fling nearby planetesimals to the outer reaches of the system, where they can form new planets.
第一个气态巨行星的另一个功效，是它的重力会把附近的微行星远远抛向系统外侧区域，让它们在该处形成新的世界。
All the big outer planets go retrograde for many months at a time each year so this is not unusual.
所有大外行星去逆行许多个月的时间，每年因此，这是不寻常。
Four planets were already known around the star, with two lying near the inner and outer edges of the habitable zone, where liquid water - and therefore potentially life - could exist on its surface.
已有四颗围绕该恒星的行星被发现，其中两颗分别位于宜居区的两端。宜居区是使生命得以可能的液态水能存在的区域。
Asteroids, also known as "minor planets", are numerous in the outer space.
小行星，亦称为“小型行星”，在外太空中。
Asteroids, also known as "minor planets", are numerous in the outer space.
小行星，亦称为“小型行星”，在外太空中不计其数。
Asteroids, also known as "minor planets", are numerous in the outer space.
小行星，亦称为“小型行星”，在外太空中不计其数。
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