Space enthusiasts will get a big bang (pun!) out of the Adler. There are public telescopes to view the stars, 3-D lectures to learn about supernovas, and the Planet Explorers exhibit where kids can 'launch' a rocket. The immersive digital films cost extra (from $13 per ticket). The Adler's front steps offer Chicago's best skyline view, so get your camera ready.
There's also much to see outside the Adler, and for free. Check out how the 1930s building has 12 sides, one for each sign of the zodiac. Sculptor Henry Moore's sundial keeps time by the main entrance, while the bronze Copernicus statue lords it over the front median.