Every Fri.–Sun. Three different audiovisual planetarium shows suitable for all ages. Sea Monsters (11:30 a.m.) follows a curious dolichorhynchops (an extinct species of marine reptile) as she travels through the most dangerous oceans in history. The Sky Tonight (12:30 & 2:30 p.m.) is an exploration of the current night sky, with tips on how to find the cardinal directions, constellations, and planets on your own. Mars: One Thousand One (1:30 p.m.) tells the story of what humans might face with the first manned journey to Mars. Various times, MNH, 1105 North University. $8 at the door. Limited capacity. 764–0478.