Rangos Omnimax Theater at the Carnegie Science Center, North Side, has opened the return of “Dolphins,” through March 24. Also showing are “Hubble,” the story of the Hubble Space Telescope and the children’s film “Animalopolis.” Omnimax is not recommended for children younger than 3. Tickets for most shows are $8 for adults and $6 for senior citizens and children. Call 412-237-3400 for show times and admission.