planetology

noun
plan·​et·​ol·​o·​gy | \ˌpla-nə-ˈtä-lə-jē \
plural planetologies

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

Other Words from planetology

planetological \ˌpla-​nə-​tə-​ˈlä-​ji-​kəl \ adjective
planetologist \ˌpla-​nə-​ˈtä-​lə-​jist \ noun

First Known Use of planetology

1865, in the meaning defined above

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The first known use of planetology was in 1865

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