Like the radial velocity technique, astrometry seeks to detect the slight wobble in a star's position caused by the gravity of an orbiting planet. Astrometry does it by plotting the star's position in the sky with extreme accuracy, through many observations repeated over time. Astronomers have been claiming the detection of "unseen companions" to stars using astrometry since 1855, but none have stood up to scrutiny. To date, there have been no confirmed exoplanet detections using the technique.
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