Noun
The word is derived from planetarium
In fact, many planetaria today have what are called projection orreries, which project onto the dome a Sun with planets (usually limited to Mercury up to Saturn) going around it in something close to their correct relative periods. Source: Internet
Explanation All orreries are planetariums or planetaria (alternative plural). Source: Internet
LCD projectors have fundamental limits on their ability to project true black as well as light, which has tended to limit their use in planetaria. Source: Internet
Most planetaria ignore Uranus as being at best marginally visible to the naked eye. Source: Internet
The goal of the project is to bring sub-$1000 planetaria to small groups of school children as well as provide technology for large public planetaria. Source: Internet
The West German firm resumed making large planetaria in 1954, and the East German firm started making small planetaria a few years later. Source: Internet