Rangos Omnimax Theater at the Carnegie Science Center, One Allegheny Ave. beside Heinz Field on the North Side, has brought back “The Polar Express” through Jan. 3 and “Rocky Mountain Express” through Jan. 10. Continuing as well are “ROBOTS,” “D-Day: Normandy 1944,” and “Mysteries of the Unseen World.” Tickets for most shows are $8.50 for adults and $6.50 for children ages 3 to 12. Omnimax is not recommended for children younger than 3. Call 412-237-3400 for show times. The Science Center has holiday hours from 10 a.m. to 7 p.m. Saturday through Wednesday and from 10 a.m. to 4 p.m. Dec. 31. The center will be closed Jan. 4.