A dwarf planet is a category of celestial bodies in the solar system
defined by the International Astronomical Union (IAU) on August 24,
2006 in Prague.
A dwarf planet is an object which is in orbit around the Sun and has
sufficient mass for its self-gravity to overcome rigid body forces so
that it assumes a hydrostatic equilibrium (nearly round) shape but has
not "cleared the neighbourhood" around its orbit.
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