The planetarium is designed with fast installation, portability and easily use. Great for school or science astronomy teaching,remote area,It can cultivate students' awareness of science and education and their love for aerospace. Door System,the tube and zipper allows adult to walk into and out of the dome easily. Also it allows for chair seating and lying freely. Estimated seating capacity : 4m dia(25 young children) 5m dia(35 young children),6m dia(50young children).syi