Discoveries of exoplanets | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-11-18

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Discoveries of exoplanets

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SUMMARY
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An exoplanet (extrasolar planet) is a planet located outside the Solar System. The first evidence of an exoplanet was noted as early as 1917, but was not recognized as such. However, the first scientific detection of an exoplanet began in 1988. Shortly afterwards, the first confirmed detection came in 1992, with the discovery of several terrestrial-mass planets orbiting the pulsar PSR B1257+12. 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 1 November 2018, there are 3,874 confirmed planets in 2,892 systems, with 638 systems having more than one planet. This is a list of the most notable discoveries.