The new COSI Planetarium—the largest in Ohio—features state-of-the-art digital technology that offers an unsurpassed glimpse of our incredible universe. The COSI Planetarium’s new Digistar 5 projection system and 60-foot dome will transport you to the farthest reaches of the galaxy, to undersea volcanoes and distant lands, and even into the human body. For all who wonder, who question, who dream, your window to the universe is now open at COSI.

The Sky Tonight
  • 10:30am
  • 1:30pm


Our Universe Above

Presented LIVE by the COSI Team, this seasonal tour of the universe is a modern planetarium show in the classic tradition of stargazing, filled with stars, planets, constellations, current science news and audience interaction. Running time: Approximately 40 minutes.
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The Sky Tonight
  • 12:30pm
  • 2:30pm


Holiday Double Feature

Holiday Double Feature: Enjoy two great Christmas-themed shows in one family-friendly program! Explore space with Santa in "The Alien Who Stole Christmas," then participate in a cosmic holiday singalong with "Let It Snow." Running time: Approximately 40 minutes.
Play "Let It Snow" Trailer
Play "Alien Who Stole Christmas" Trailer
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The Sky Tonight
  • 11:30am
  • 3:30pm


One World, One Sky: Big Bird's Adventure

Explore the night sky with your favorite friends from Sesame Street! Follow along with Big Bird, Elmo and their friend from China, Hu Hu Zhu, as they take you on a journey of discovery to learn about the Big Dipper, the North Star, the Sun and the Moon. Running time: Approximately 40 minutes.
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Rent It Host your wedding, party, or private event under swirling galaxies and spectacular starscapes, no matter what the weather outside. The COSI Planetarium is available for weddings, birthday parties, corporate events, and family reunions, and offers customized starshows and seating for over 200 guests. For private rentals, please contact the This email address is being protected from spambots. You need JavaScript enabled to view it.. For birthday parties, please contact the This email address is being protected from spambots. You need JavaScript enabled to view it..