planetarium
plan·e·tar·i·um / ˌplaniˈte(ə)rēəm/ • n. (pl. -tar·i·ums or -tar·i·a / -ˈte(ə)rēə/ ) 1. a building in which images of stars, planets, and constellations are projected on the inner surface of a dome for public entertainment or education. ∎ a device used to project such images.2. another term for orrery.
planetarium
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