The definition of a planet includes the following from the International Astronomical Union:

  • A celestial body that is in orbit around the sun.
  • Is massive enough for it’s self-gravity to create a nearly round shape.
  • Has cleared the neighborhood around it’s orbit.

So, the only winning candidates for this definition are . . . drumroll please, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune (Pluto has not cleared its orbit).


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