Celebrate the International Year of Astronomy with hands-on astronomy activities, live entertainment, films, a stellar presentation by a resident astronomy expert, and complimentary refreshments. Build a scale model of the solar system, guess your age and weight on other planets, and get a head start on your holiday shopping by taking advantage of your Members 20% Store discount and our complimentary gift-wrapping service. We are collecting donations for the San Francisco Firefighter’s Toy Program; you can bring a toy to donate or buy one at the Exploratorium Store. Reserve your space today.