noun \ˌpla-nə-ˈtä-lə-jē\
plural plan·et·ol·o·gies

Definition of PLANETOLOGY

:  a branch of astronomy that deals with the condensed matter of the solar system and especially with the planets and their moons
plan·et·o·log·i·cal \ˌpla-nə-tə-ˈlä-ji-kəl\ adjective
plan·et·ol·o·gist \ˌpla-nə-ˈtä-lə-jist\ noun

First Known Use of PLANETOLOGY



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