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planetology

[plan-i-tol-uh-jee]
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noun
  1. the branch of astronomy that deals with the physical features of the planets.

Origin of planetology

First recorded in 1905–10; planet + -o- + -logy
Related formsplan·e·to·log·i·cal [plan-i-tl-oj-i-kuh l] /ˌplæn ɪ tlˈɒdʒ ɪ kəl/, adjectiveplan·e·tol·o·gist, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for planetologist

planetology

noun
  1. astronomy the study of the origin, composition, and distribution of matter in the planets
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012