Groups of 20-30 can experience a simulated mission in the Challenger Learning Center on an appointment basis at the Coca-Cola Space Science Center. The Westrock Observatory is an attraction open to the public once a month for astronomical viewing. There is an admission fee to experience hands-on exhibits, shows in the Omnisphere Theatre and Challenger Learning Center missions. When you visit you will experience a sky tour and planetarium show, tour of a space shuttle, Apollo artifacts, and visit to the International Space Station in a 360 degree theater. While visiting the Center, step across the street and visit Heritage Park, an interactive tribute to Columbus' industrial past.