planetology

noun

branch of astronomy that deals with the condensed matter of the solar system and especially with the planets and their moons

Wiktionary

noun

Etymology: Etymology tree English planet Ancient Greek -ο- (-o-)der. Latin -o-bor. English -o- Proto-Indo-European *leǵ- Ancient Greek λόγος (lógos) Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-i-eh₂ Proto-Hellenic *-íā Ancient Greek -ῐ́ᾱ (-ĭ́ā) Ancient Greek -λογῐ́ᾱ (-logĭ́ā)bor. Latin -logialbor. French -logiebor. English -logy English -ology English planetology From planet + -ology.

The study of planets, planetary systems and the solar system.