A planetarium is a theatre built primarily for presenting educational and entertaining shows about astronomy and the night sky, or for training in celestial navigation which is typically projected on a large dome-shaped projection screen onto which scenes of stars, planets and other celestial objects can be made to appear and move realistically to simulate the complex 'motions of the heavens'. Planetarium range in size from the Hayden Planetarium's 21-meter dome seating 423 people, to three-meter inflatable portable domes where children sit on the floor,. Such portable planetaria serve education programs outside of the permanent installations of museums and science centers. Today there are also numerous apps and computer simulations which display similar content on small screens -- that said it is no match for the immersive nature of a true planetarium.
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