exoplanet
See also: List of extrasolar planet firsts Number of extrasolar planet discoveries per year through September 2014, with colors indicating method of detection: radial velocity transit timing direct imaging microlensing An exoplanet (extrasolar planet) is a planet located outside the Solar System . The first planet was announced in 1992, with two planets found orbiting a pulsar . The first confirmation of an exoplanet orbiting a main-sequence star was made in 1995, when a giant planet was found in a four-day orbit around the nearby star 51 Pegasi . Some exoplanets have been imaged directly by telescopes, but the vast majority have been detected through indirect methods such as the transit method and the radial-velocity method . As of February 22, 2017, astronomers have identified 3,583 such planets ...
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