The bulb shines though a starsphere which has 1,000 holes drilled in it in the patterns of the constellations that we see in the sky. Brighter stars have larger holes in the starsphere. The dome of the planetarium represents the sky. The bottom of the dome represents the horizon. Preparing your class for a visit to the Planetarium Teachers please go over the material below which would be appropriate for your class before you bring your class to the planetarium.
Light year is the distance that light travels in one year.
How to measure angles . Stars - emit their own light because they are hot. Planets shine by reflected light and circle stars. Galaxy - a large collection of stars. The Milky Way galaxy contains 100 million stars.