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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.
Until now," said Philippe Paillou, a planetologist at Bordeaux University," about a dozen meteorite crater clusters have been discovered worldwide, of which the largest is the Campo del Cielo in Argentina.
A planetologist is a scientist who studies planets and their moons.
Clark Chapman, a planetologist at the Planetary Science Institute in Tucson, Arizona, says that more research is needed on cosmic collisions.
To the working planetologist, his most important tool is human beings," his father said.
Caltech planetologist Andrew Ingersoll argues that Uranus and Neptune are at one end of a meteorological spectrum defined by the amount of thermal energy available to planets to drive turbulence in their atmospheres.