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planetology

noun

plan·​et·​ol·​o·​gy ˌpla-nə-ˈtä-lə-jē How to pronounce planetology (audio)
plural planetologies
: a branch of astronomy that deals with the condensed matter of the solar system and especially with the planets and their moons
planetological adjective
planetologist noun

Word History

First Known Use

1865, in the meaning defined above

Time Traveler
The first known use of planetology was in 1865

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