Planetologist
[plan-i-tol-uh-jee] /ˌplæn ɪˈtɒl ə dʒi/
noun
1.
the branch of astronomy that deals with the physical features of the .
/ˌplænɪˈtɒlədʒɪ/
noun
1.
(astronomy) the study of the origin, composition, and distribution of matter in the planets
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