planetologist

planetology

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

Origin:
1905–10; planet + -o- + -logy

planetological [plan-i-tl-oj-i-kuhl] , adjective
planetologist, noun
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World English Dictionary
planetology (ˌplænɪˈtɒlədʒɪ)
 
n
astronomy the study of the origin, composition, and distribution of matter in the planets

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