planetarium, Institution devoted to popular education in astronomy and related fields, especially space science, whose main teaching tool is a hemispheric screen onto which images of celestial objects as seen from Earth are projected from an instrument also known as a planetarium, or planetarium projector. Major planetariums have extensive exhibit space, museum collections, sizable staffs, projection domes 80 ft (25 m) or more across, and seating capacities of over 600.
planetarium Article
planetarium summary
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Below is the article summary. For the full article, see planetarium.