通行的原子标志是直白的：几个点循极细的轨道环绕着一个黑点。
The popular symbol of the Atom is stark: a black dot encircled by the hairline orbits of several other dots.
它只是星际空间的一块岩体，受火星引力作用而被吸引住，并沿着轨道环绕火星运动。
It is a space rock captured and now held in orbit by the gravity force of Mars.
因为有卫星的头衔，而且沿椭圆形轨道环绕地球运行，月亮似乎每天平均51分钟返回到天空的同一地点。
Due to the moon's titled and elliptical orbit around Earth, the moon seems to return to the same place in the sky 51 minutes later each day, on average.
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