Planet X (disambiguation)

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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

In music

Other uses

[edit] See also


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