Planet

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A planet is a body which orbits a star; is in hydrostatic equilibrium under it's own mass; and dominates the region of space in which it moves (i.e. the gravity and rotation of the object have caused it to assume a roughly spherical shape and the region of it's orbit is generally free from other forms of astronomical matter)[1].

References

  1. http://www.iau.org/iau0603.414.0.html