HARPS能检测到到由像地球一样小的行星引起的轻微的引力摇摆，只要它们无限接近运行轨道。
HARPS can detect the slight gravitational wobble caused by planets as small as Earth, if they have incredibly close-in orbits.
假定系统继续运行，我和所说的那样，我们可以很好地从地面指挥和操作飞船，使它无限期地留在轨道上。
Assuming the systems keep operating, like I've said, we can command the vehicle from the ground and operate it fine, and remain on orbit indefinitely.
我们规定，无限大时,势能为，这就是为什么所有的,规则轨道总能量为负。
We have defined potential energy 0 to be zero at infinity, and that is why all bound orbits have negative total energy.
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