Jennings Environmental Education Center will host "Mollusks in Your Backyard" at 2 p.m. Sunday. Jennings is regularly open from 8 a.m. to 4 p.m. weekdays and on weekends as scheduled. The trails are open daily from sunrise to sunset. Call 724-794-6011 to confirm programs.

<B>A Star Party</B>, sponsored by the Amateur Astronomers Association of Pittsburgh is planned for Friday and Saturday at the Nicholas E. Wagman Observatory in Deer Lakes Regional Park, Frazer Township.This event is part of the worldwide star party celebrating the IYA2009 (International Year of Astronomy) that will run for 100 hours from today through Sunday. Each day's events will start at about 7:45 p.m., weather permitting.Call 724-224-2510. Admission is free, though donations are accepted to help cover the costs of operation.