One World, One Sky: Big Bird's Adventure (OWOS) is a bi-national, China-US cooperative project to produce and distribute a planetarium show based on popular characters from Sesame Workshop's television productions in each country for preschool- and kindergarten-aged children, as well as accompanying outreach materials for children, parents and teachers to further enhance learning. The project aims to: (1) provide young Chinese and American children aged four to six with an age-appropriate introduction to astronomy; (2) promote positive attitudes toward science among young children in both