Tenth planet is a term formerly applied to possible planets beyond Neptune, before the reclassification of Pluto. It may also refer to:

Astronomy

  • 2060 Chiron, claimed by some to be the tenth planet upon discovery
  • 15760 Albion, then nicknamed "Smiley" and hailed as the tenth planet
  • Eris (dwarf planet), referred to by some to be the tenth planet after discovery, up to the reclassification of Pluto

Other uses

See also

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