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Planet X is a large hypothetical planet orbiting beyond the orbit of Neptune. The X stands for "unknown", not the Roman number 10; there were only 8 known planets at the time. Its existence, first as a ninth planet, and after 1930 as a tenth, was postulated on the basis of apparent discrepancies in the orbits of the gas giants, especially those of Uranus and Neptune. Those discrepancies have largely been resolved by modern measurement, removing the basis for Planet X.

Although Pluto was discovered as a result of the search for Planet X, it is not Planet X. Kuiper Belt object 2003 UB313 is not Planet X either, although its discoverers are pushing for the International Astronomical Union to designate it as a tenth planet.

In popular culture, "Planet X" has become a generic stand-in term for an undiscovered planet in the solar system. Its use by scientists, however, is exclusively in reference to the particular hypothesis discussed below.

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Artist Direct: Planet X - Includes biography, discography, and links.
Meta Description: [ Planet X feature on ARTISTdirect. Includes free downloads, music videos, bio, discography and merchandise information ]

GarageBand.com: Planet X - Profile and sound files.
Meta Description: [ The web's largest independent music community and home to the definitive charts of the best emerging artists. Visit GarageBand.com for FREE mp3 downloads or to promote your music. ]

Rollingstone.com: Planet X - Includes biography, recordings, and message board.
Meta Description: [ Rolling Stone gives you total Planet X coverage including free music, videos, photos, music news and exclusive Rolling Stone articles. ]

404 Sacramento News and Review - Profile of the band.

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Here's a Planet X video from their moonbabies tour. This song will appear on their next album.Virgil Donati, Tony ...
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