One World, One Sky

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Big Bird's Adventure
You don't need a spaceship to learn about the sun, moon, and stars—just a little imagination! When Big Bird, Elmo, and their friend from China, Hu Hu Zhu, take an imaginary trip to the moon, they learn amazing things along the way.

    • Toddler Basics
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    • ABCs
    • 123s
    • Discovery
    • Family Talk
    • Sharing & Caring
    • Create
    • Special Days

Fun Facts

Nurture your child's scientific curiosity and sense of wonder by taking your own fun adventure to the sky. Afterward, look in books or go online to collect facts about the places you "visited." Discovering more about the universe helps your child build an appreciation for the one world and one sky that we all share.

  • Did you know the sun is actually a star? It looks bigger and brighter than all the other stars because it's much closer to us.
  • You can't fly a kite on the moon because there is no wind.
  • The stars in the sky are thousands of millions of years old.
  • Everything weighs about six times less on the moon than it does on earth.

  • Quick Tips for Parents and Caregivers View all tips ›

    About This Project

    One World, One Sky: Big Bird's Adventure was created as part of a global partnership between the Adler Planetarium; Sesame Workshop, the nonprofit educational organization behind Sesame Street; the Beijing Planetarium; and the Liberty Science Center (Jersey City, NJ). It featured a planetarium show and educational outreach materials for children ages 4—6 and their families, teachers, and caregivers.