Fifth planet

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Fifth planet may refer to:

  • Jupiter, the fifth planet from the Sun in the Solar system
  • Fifth planet (hypothetical), any of various hypothetical planets thought to have existed
  • Fifth Planet, a science fiction novel by Fred and Geoffrey Hoyle
  • Planet V, a scientific proposal in 2002 for destroyed fifth planet
  • Mars, the fifth planet from Earth in the Ptolemaic geocentric model
  • Ceres (dwarf planet), the dwarf planet orbiting between Mars and Jupiter in the asteroid belt

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