火星是离太阳第四远的行星，也是地球之外的下一个行星。

Mars is the fourth planet from the Sun and the next planet beyond the Earth.

youdao

现在归类于矮行星的冥王星是那么小，那么远，对天文学家来说，其表面一直是个谜。

Pluto, now classed as a dwarf planet, is so small and so distant that its surface has been a mystery to astronomers.

youdao

这意味着如果我们将来对这颗离我们20.5光年远的行星有任何殖民打算的话，只能再说了。

That means we'll have to put any distant plans to colonize the planet that's 20.5 years away from our own on hold.

youdao

Then the acceleration of the planet is the force of gravity between the planet and the Sun, which Newton will tell you is directed towards the Sun and it depends on how far you are.

行星的加速度源自,行星和太阳之间的作用力,牛顿认为这个力指向太阳,它的大小取决于行星离太阳有多远

耶鲁公开课 - 基础物理课程节选