Hours: Museum open daily 10-5, July-Aug.; Tues.-Sun. 10-5, in Sept.; Wed.-Sun. and Mon. holidays 10-5, rest of year. IMAX films are shown Tues.-Sun. noon-5, Sat. noon-8. Planetarium shows Sat.-Sun. at 11:15 and 3:15 (also Mon.-Fri. at 11:15 and 3:15, July-Aug.). Hours vary during school breaks; phone to confirm. Closed Easter, Thanksgiving and Christmas.