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.

More on [ Planet X ]

epic records news

Brandy's New Album, Human
Fri, 15 Aug 2008 19:54:36 -0000
Brandy's new album, Human, will be released on November 11, 2008. "Human is my most personal album to date," said Brandy. "I have grown so much since my last album.  Being able to express myself and my journey through my music is a feeling I can't describe."
Brandy's New Single "Right Here (Departed)"!
Thu, 14 Aug 2008 18:22:29 -0000
Listen to Brandy's new single "Right Here (Departed)" at www.foreverbrandy.com!
"Hiroshima" Video Premiere!
Tue, 05 Aug 2008 18:27:21 -0000
Check out the video premiere for "Hiroshima" here on AOL Spinner!

Subscribe to Bands_and_Artists RSS feed