Researchers using observations gathered by NASA’s Kepler Telescope claim the first discovery of a non-transiting exoplanet, revealed through gravitational perturbations called transit timing variations, or TTVs. The TTV technique, first proposed as a strategy for finding Earth-like exoplanets seven years ago, could reveal evidence of more extrasolar planets hidden away in existing Kepler observation data. The discovery of an unseen Planet C, circling the star Kepler Object of ...

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