planetary

adjective
plan*e*tary \ ˈpla-nə-ˌter-ē \
1607{ds||1|a|}
  • of, relating to, being, or resembling a planet
  • erratic, wandering
  • having a motion like that of a planet

planetary nebula

noun
planetary nebula \
1785
  • a usually compact luminous ring-shaped nebula that is composed of matter which has been ejected from a hot star at its center

planetary science

noun
planetary science \
1969
  • planetology
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