A [b]planetarium[/b] (plural [b]planetaria[/b] or [i][[ranguage|planetariums]][/i]) is a [[theater]] built primarily for presenting educational and entertaining shows about [[astronomy]] and the [[night sky]], or for training in celestial navigation. A dominant feature of most planetaria is the large [[dome]]-shaped projection screen onto which scenes of [[star_(sky)|stars]], [[planet|planets]] and other celestial objects can be made to appear and move realistically to simulate the complex "motions of the heavens".

Can also be used to describe an object that projects star-like lights on a surface (such as the ceiling). 

h4. External links

* "[i]Wikipedia[/i] article":https://en.wikipedia.org/wiki/Planetarium
planetarium