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Definitions:
Noun
planetarium
Definition: a building housing an instrument for projecting the positions of the planets onto a domed ceiling
planetarium
Definition: an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome
planetarium
Definition: an apparatus or model for representing the solar systems
Definition: A display museum in which images of stars and other astronomical phenomena are projected onto a domed ceiling.