A planetarium (plural planetaria or planetariums) is a theatre 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 stars, planets and other celestial objects can be made to appear and move realistically to simulate the complex 'motions of the heavens'. The celestial scenes can be created using a wide variety of technologies, for example precision-engineered 'star balls' that combine optical and electro-mechanical technology, slide projector, video and fulldome projector systems, and lasers. Whatever technologies are used, the objective is normally to link them together to provide an accurate relative motion of the sky. Typical systems can be set to display the sky at any point in time, past or present, and often to show the night sky as it would appear from any point of latitude on Earth.
All of your efforts whisper secrets to me
I laugh at their frailty
I see all
Where will you go when the mountain impedes you?
I am the harrowing voice in the wind
I am the White Wizard
I am the tongue of flame that tastes the breast of the
mother
She will quake in her pleasure
and bury you beneath her
It is unwise to face the fingers of the deep
You should have risked the western way
The doors of Durin have remained sealed for an age
starving the dark remains of Moria
The era has ended
that place is a forgotten tomb
your names will echo through