Planet X

Planet X was a hypothetical ninth planet believed to be beyond Neptune from the early 1900s until the discovery of Pluto in 1930, and a hypothetical tenth planet beyond Pluto from 1978 before finally being disproven in 1993. The term has since been reused to describe other hypothetical trans-Neptunian planets.

Planet X may also refer to:

In science fiction

• Planet X (comics), a 2004 X-Men storyline.
• Planet X (Star Trek) is a 1998 novel depicting a crossover between X-Men and Star Trek
• The Man from Planet X, a 1951 science fiction film directed by Edgar G. Ulmer
• The Strange World of Planet X, a 1957 British science fiction horror novel by Rene Ray
• The name for several Fictional planets of the Solar System
• The name for several fictional extrasolar planets

In music

• Planet-X, an album by bassist Jimmy Johnson.
• Live from Planet X, a live album by MF Doom
• Planet X (band), a progressive metal band founded by Derek Sherinian
• Plan-It-X Records, a DIY punk rock record label

Other uses

• Nibiru, a planet believed by some people to be on the verge of destroying Earth in the Nibiru cataclysm
• Operation Planet X, a military operation during the Iraq War in 2003
• Planet X (bike), an English bicycle company
• Planet X Television, an action sports TV show

See also

• List of hypothetical Solar System objects
• Trans-Neptunian object

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