最后,科学家测量了由于行星的引力拖拉而产生的恒星摆动,这就是径向速度。
Finally, scientists measure the star's wobble due to the planet's gravitational tug, known as the radial velocity.
是为了让火箭的速度足够快,足以逃离地球的引力。
It is to get the rocket going fast enough to escape Earth's gravity.
逃逸速度就是一个物体的速度,比如说,从加农炮中射出的最小初始速度,这样这个物体以后就可以自己脱离地球的引力。
Escape velocity is simply the speed of an object that's shot out of a cannon the minimum initial speed so that the object could later escape Earth's gravity on its own.
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