Ninth planet (disambiguation)

From Wikipedia, the free encyclopedia

Ninth planet may refer to:

  • Pluto, widely considered the ninth planet in the Solar System from 1930 until 2006
  • Neptune, the ninth-closest planet from the Sun from 1979 to 1999 (with Pluto then considered the eighth-closest planet from the Sun)
  • The asteroid 2 Pallas, considered to be the ninth planet in chronological discovery order from 1802 until its reclassification as a minor planet in the 1850s
  • Jupiter, considered the ninth-closest planet from the Sun from 1807 to 1845 as a result of the discovery of minor planets
  • Planet X, various hypothetical planets beyond Neptune

See also

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