Planet X (disambiguation)

Planet X may refer to:

Astronomy
  • Planet X, a hypothetical planet, now disproven, proposed in 1906 by Percival Lowell to have existed beyond the planet Neptune.
    • Colloquially, and by extension, any hypothetical trans-Neptunian planet, in particular Planet Nine.

Science fiction

Music

Other uses
gollark: I still struggle with ξ (yes I do have Greek character macros set up for these extremely rare situations).
gollark: They're mostly not *too* horrible and you can at least copy the simple ones fairly easily.
gollark: I mean, sure, you could, but it's a lot of effort just to use more mathy stuff.
gollark: Δ you.
gollark: They're hard to draw if you're not used to it.

See also
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