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According to the 2006 definition from the International Astronomical Union, there are three main requirements:

  • it is a celestial object which orbits the Sun (or in the case of exo-planets, orbits another star);
  • it is massive enough so that its own gravity can overcome rigid-body forces and attain a hydrostatic equilibrium shape. That is, it is approximately spherical;
  • it has cleared the neighbourhood around its orbit.
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7y ago

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