Aplanetarium(pluralplanetariaorplanetariums) is atheaterbuilt primarily for presenting educational and entertaining shows aboutastronomyand thenight sky, or for training in celestial navigation. A dominant feature of most planetaria is the largedome-shaped projection screen onto which scenes ofstars,planetsand other celestial objects can be made to appear and move realistically to simulate the complex "motions of the heavens".
planetarium