The Christa McAuliffe Center at Framingham State University opens its planetarium for free public presentations on the third Friday of each month (except April), with topics each month within one of three series:  Family Night, Late Nite Skies, and Stellar Nursery. On March 15, 7-8:30PM, the Late Nite Skies series will show the film, Undiscovered Worlds: The Search for Life Beyond Our Sun. Space is limited, and for guaranteed seating you must pre-register and arrive 15 minutes before show time (directions and parking).