What Is a Planetarium?

Answer

A planetarium is a building in which images of stars, planets and constellations are projected on the inner surface of a dome for public entertainment or education. The celestial scenes are created using a wide variety of technologies, such as precision-engineered 'star balls' that combine optical and electro-mechanical technology, slide projector, video and full dome projector systems and lasers. Planetarium also refers to an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome.
3 Additional Answers
Ask.com Answer for: what is a planetarium
plan·e·tar·i·um
[plan-i-tair-ee-uhm]
NOUN [PLURAL PLAN·E·TAR·I·UMS, PLAN·E·TAR·I·A]
1.
an apparatus or model representing the planetary system.
2.
a device that produces a representation of the heavens by the use of a number of moving projectors.
3.
the building or room in which such a device is housed.
Source: Dictionary.com
A planetarium has a large room with a dome ceiling that seats lots of people. There is a projector that can show you what the stars look like at night, this projector shoots the pictures on the domed ceiling. There may be telescopes in a planetarium where you can look and see the stars for yourself.
A planetarium is a really neat place, it is usually a huge theater that shows different movies about the stars, planets and the sky. Most planetariums have their movies projected onto the ceiling.
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