Planet X

Details Planet X Planet X

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4449.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4449. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Solar System, Solar System Models And Concepts

Scientific paper

A name given to a hypothetical tenth major planet once believed to exist in the outer solar system, beyond the orbit of Neptune. The `X', which stood for `unknown', was also appropriate as the roman numeral for `ten'. The label `Planet X' was originated by Percival Lowell. From the late nineteenth century, he and others, including William H Pickering, worked out orbits for a large tenth planet wh...

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