Fifth planet may refer to:

Astronomy

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  • Jupiter, fifth planet from the Sun in our Solar System
  • Fifth planet (hypothetical), any of various hypothetical planets thought to have existed
  • Planet V, 2002 scientific proposal for a destroyed fifth planet
  • Mars, fifth planet from Earth in the Ptolemaic geocentric model
  • Ceres (dwarf planet), dwarf planet between Mars and Jupiter in the asteroid belt

Fiction

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See also

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