径向速度法，即观察某颗行星环绕恒星的轨道所引起的恒星相对地球来往的速度变化。
The radial velocity method, which looks for changes in a star's velocity toward or away from Earth triggered by a planet's orbit around that star.
但是，近年来天文学家通过径向速度法去发现或证实大量小到只有几倍的地球质量的行星。
But in recent years astronomers have used radial velocity to find or confirm a number of planets down to a few times Earth's mass.
行星越重，就越容易通过径向速度法侦测（本质上是行星引力对恒星的扰动）。
The more massive a planet, the easier it is to detect using radial velocity measurements (essentially the star's wobble as a planet's gravity tugs it).
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