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The Theory is different depending on which culture you're referring to.




Scientificly the planets are divided between two main types. Terrestrial (rocky/Earth-like) and Jovian (Gas giants/Jupiter-like) planets.
In our Solar System there are 4 of each. Earth, Venus, Mars and Mercury are terrestrial and Jupiter, Saturn, Uranus and Neptune are jovian.
So far all extra-solar planets discovered are jovian because at the moment we can only detect large planets.
Anything between the sizes of Eris and Ceres (Which includes Pluto but excludes 19 moons) are considered dwarf planets. Anything smaller is a minor planet (also called asteroids or planetoids).

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15y ago

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