Planet
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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.
Young Earth Creationism View
Young earth creationist assert that materialistic explanations of the planet formation are inadequate and contra-evidence. [2]