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planet wheel
planetar
planetarium
planetary
planetary gear
planetary nebula
planetesimal
planetoid
planetology
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planetology
plan·e·tol·o·gy [ plànnə tólləjee ]


noun 
Definition:
 
study of planets: the branch of astronomy that studies the origin and composition of the planets and other solid bodies in the solar system such as comets and meteors

plan·e·to·log·i·cal [ plànnətə lójjik'l ] adjective
plan·e·tol·o·gist noun
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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