On Saturday, May 7, 2011, the National Air and Space Museum on the National Mall will be hosting Space Day from 10:00 am to 3:00 pm. This free annual event, sponsored by Lockheed Martin, provides visitors with opportunities to learn about space through hands-on exhibits, activities, and presentations by astronauts and other space experts. In keeping with the program’s mission to provide a fun learning experience for all ages, there will be several activity and presentation stations for children and teens, including Alka Seltzer-powered rockets, astronaut paper dolls, and LEGO spacecraft models.