Noun: planetarium (planetariums,planetaria) ,pla-ni'teh-ree-um
- An optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome
"The new planetarium projector could simulate the night sky with incredible accuracy"
- A building housing an instrument for projecting the positions of the planets onto a domed ceiling
"We visited the planetarium to watch a show about black holes"
- An apparatus or model for representing the solar system
"The children were fascinated by the miniature planetarium in the science museum"
Derived forms: planetaria, planetariums
Type of: building, edifice, model, optical device, simulation
Encyclopedia: Planetarium