No the sun is not a planet, it is a star. The difference between being a planet and a star is that stars consist of mass amounts of gas trapped by gravity and radiation in an equilibrium state known as hydrostatic, which the sun does. As seen by the controversial debate on whether or not Pluto is a planet there is not always a clear-cut definition of a planet. However, the International Astronomical Union (IAU) agree on a definition in 2006: a “celestial body that: (a) is in orbit around the sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighborhood around its orbit.” Obviously the sun cannot meet this criteria because it cannot orbit around itself. While the sun seems nothing like its fellow stars when you look towards the sky, you must remember that the sun is one of the largest stars and is much much closer to us in proximity than any other star.
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