The first confirmed exoplanet discovery was in 1992, with the discovery of PSR B1257+12 around a pulsar star the first main-sequence star discovery (51 Pegasi b) was found in 1995. The urge to classify planets has increased since exoplanet discoveries became more frequent. In 2017, a group of scientists, including Stern, proposed a new definition of planet, which they plan to submit to the IAU: "A planet is a sub-stellar mass body that has never undergone nuclear fusion and that has sufficient self-gravitation to assume a spheroidal shape adequately described by a triaxial ellipsoid regardless of its orbital parameters." Classifying planets
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