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"Astronomers have searched for exoplanets around Tau Ceti before and turned up nothing. But in the new study, researchers were able to pull five possible planetary signals out from under a mountain of noise.Tuomi and his team re-analyzed 6,000 observations of Tau Ceti made by three different spectrographs, instruments that allow researchers to detect the tiny gravitational wobbles orbiting planets induce in their parent stars."