Last modified on 6 April 2007, at 09:27


This is an old revision of this page, as edited by CoulterMan (Talk | contribs) at 09:27, 6 April 2007. It may differ significantly from current revision.

A planet is a astronomical body that is in orbit around a star, has sufficient mass for its own gravity to overcome rigid body forces so that it assumes a nearly round shape, and has cleared the neighborhood around its orbit [1].

The phrase "cleared the neighborhood around its orbit" refers to a body "sweeping out" the area around its orbit as it forms, by causing all other smaller bodies in its orbit to accrete with it. As a consequence it does not then share its orbital region with any other bodies of significant size, except for satellites or those collected later under its gravitational influence.