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The branch of astronomy that deals with the composition and structure of the planets of the solar system and with the relationships, similarities, and differences between them.

plan′e·to·log′i·cal (plăn′ĭ-tl-ŏj′ĭ-kəl) adj.
plan′e·tol′o·gist n.


(Astronomy) astronomy someone who studies or specializes in planetology
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References in periodicals archive ?
I am his Imperial Majesty's Planetologist," he whispered, "planetary ecologist for Arrakis.
Very soon he became known as a serious physicist, and also as an outstanding planetologist.
Thomas Jones, a retired scientist astronaut and planetologist who flew four Space Shuttle missions, installed the centerpiece module of the International Space Station during his final mission.