Ninth planet (disambiguation)

Ninth planet, The Ninth planet, or Planet 9 are terms associated with the concept of planets beyond Neptune, after the reclassification of Pluto.

The term Planet Nine is another such term. In addition, it is used to name Planet Nine, a hypothetical large ninth planet in the Solar System.

It may also refer to:

Historical ninth planet

  • 2 Pallas, asteroid 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
  • Neptune, the ninth-closest planet from the Sun from 1979 to 1999 (while Pluto was closer to the Sun)
  • Pluto, considered to be the ninth planet from its discovery in 1930 until its reclassification as a dwarf planet in 2006 (including the twenty-year period from 1979 to 1999 when Pluto was closer to the Sun than Neptune)

Other

See also


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