The radial velocity method picks up on the tiny wobbles an orbiting planet induces in its parent's star's motion toward or away from Earth.

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David F. Gray, Kevin I. T. Brown, Precise Spectroscopic Radial Velocity Measurements Using Telluric Lines, Publications of the Astronomical Society of the Pacific, Vol. 118, No. 841 (March 2006), pp.

A new ground-based instrument being built by the Harvard-Smithsonian Center for Astrophysics will help NASA's planet-scouting Kepler spacecraft confirm and characterize potential alien planets.