Planetarium -

: Modern domes are often made of perforated aluminum sheets. These millions of tiny holes allow for proper air ventilation and prevent sound from echoing, ensuring an immersive audio-visual experience.

: Often called a "star projector" or "starball," these devices (like the famous Zeiss models) project high-resolution images of stars and planets onto the dome. Planetarium

My Little Planetarium : 8 Steps (with Pictures) - Instructables : Modern domes are often made of perforated aluminum sheets

If you can’t make it to a professional theater, there are several ways to bring the stars home: Planetarium