When my daughter started asking questions about the stars and universe, we took her to the Planetarium at the Mt. Hood campus. For a very small sum she learned all she wanted and more. As it is a college performance, it is done in a lecture format vs. for entertainment. They offer a variety of shows seasonally in the warmer times of year.
Each week highlights a different phenomenon in the sky. The seating is a little uncomfortable and the parking difficult if you are not already a student at the college. But it is an excellent inexpensive educational experience.