One World, One Sky: Big Bird's Adventure is a planetarium show developed for the United States and China. Designed as an introduction to astronomy for children, Big Bird, Elmo and Hu Hu Zhu embark on a journey through space to learn about the sun, stars and constellations. On an imaginary trip to the Moon, the trio discover how different it is from Earth. They learn how to find the Big Dipper constellation and the North Star, and there's a sing-along of "Twinkle Twinkle Little Star".