The 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 Digistar 7 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.
Astra and Sirius
Meet Astra, an extremely curious little girl, and her loyal friend Sirius. Together they embark on an exciting mission into space and send digital postcards from their breathtaking stops.
During the show you will:
- Travel into space together with the two brave heroes.
- Learn the answers to the most interesting and fun questions about the Universe.
- Discover the beauty of the night sky and the most famous constellations.
- Visit amazing objects in our solar system up close.
Playing September 26, 2026 - November 21, 2026 at the following times:
10:30am
11:15am
12:00pm
12:45pm
Included with COSI General Admission. Seating in the Planetarium is first-come, first-served.
Showtimes subject to change without notice. Download the COSI app before your visit for quick access to up to date showtimes!
Moonbase: The Next Step
It has been over 50 years since humankind last set foot on the moon… Now we are going back... Multinational efforts are being made to return before the end of this decade and to stay for good.
MOONBASE: THE NEXT STEP tells the story of this human endeavor, visualizing the scientific and technological advances needed to achieve this dream. How to safely travel 250,000 miles and survive the hostile and alien conditions of reduced gravity, extreme temperatures and toxic lunar dust. How do we establish a foothold on the Moon? Can we explore the vast landscape and extract the resources needed to live there on a permanent basis?
Follow our story filled with awe, danger and trepidation and share the wonder of a breathtaking lunar experience.
Playing September 26, 2026 - November 21, 2026 at the following times:
1:30pm
2:15pm
3:00pm
3:45pm
Included with COSI General Admission. Seating in the Planetarium is first-come, first-served.
Showtimes subject to change without notice. Download the COSI app before your visit for quick access to up to date showtimes!
Assisted listening devices are available for all shows within the Planetarium at no extra cost. A photo ID is necessary to borrow the device. Please request the devices at the Guest Services desk. If you are planning a visit as a group you can make this request in advance.
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..