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Planet X is a disproved hypothetical planet proposed in 1906 by Percival Lowell to have existed beyond the planet Neptune.

Contents

• Astronomy
• Science fiction
• Music
• Other uses
• See also

Planet X may also refer to:

Astronomy

• Colloquially, and by extension, any hypothetical trans-Neptunian planet, in particular Planet Nine.

Science fiction

• Planet X, the home planet of Marvel Comics character Groot and other flora colossi
• "Planet X" (comics), a 2004 X-Men comic book story-line
• Planet X (Star Trek), a 1998 novel depicting a crossover between The X-Men and Star Trek
• The name for several fictional planets of the Solar System
• The planet Daffy Duck seeks in the 1953 Merrie Melodies cartoon Duck Dodgers in the 24½th Century
• The home planet of the Xiliens, a fictional alien race featured in the 1965 kaiju film Invasion of Astro-Monster
• A planet in David Ossman's 1973 sci-fi comedy album How Time Flys

Music

• Planet X (Derek Sherinian album), 1999
• Planet X (Helios Creed album), 1994
• Planet-X, an album by bassist Jimmy Johnson
• Planet X (band), a progressive metal band founded by Derek Sherinian
• Plan-It-X Records, a DIY punk rocks record label

Other uses

• Nibiru cataclysm, a supposed impending disastrous encounter between Earth and a large astronomical object
• Operation Planet X, a military operation during the Iraq War in 2003
• Packages from Planet X , a 2013-14 animated television series created by Jeff Harter and aired on Teletoon
• Planet X Limited, a British bicycle company
• Planet X Television , an action sports TV show

See also

• List of hypothetical Solar System objects
• Trans-Neptunian object
• Tenth planet (disambiguation)
• Ninth planet (disambiguation)

This disambiguation page lists articles associated with the title Planet X.
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