Planetariums are usually domed theaters with rows of chairs arranged for people to sit comfortably while watching a video or demonstration about astronomy that is played by a projector and, often times, controlled by an operator.
The Adler Planetarium was built in 1930 and is the oldest planetarium in existence today.
Birla planetarium
No, it is not an adverb. Planetarium is a noun, an astronomical theater.
Montreal Planetarium was created in 1966.
Hayden Planetarium was created in 1935.
Alfa Planetarium was created in 1978.
Eisinga Planetarium was created in 1781.
Jawahar Planetarium was created in 1979.
Planetarium - Burma - was created in 1968.
Planetarium of Nantes was created in 1980.
Minnesota Planetarium was created in 2003.
McLaughlin Planetarium was created in 1968.