The Harvard-Smithsonian Center for Astrophysics (60 Garden Street in Cambridge) will host its monthly Observatory Night on March 17 at 7:30PM on the topic of Where Do Planets Come From?.  The lecture is intended for high-school and older audiences but children are welcome.  Admission is free, no reservations are necessary, and seating is limited.  For more information, call 617-495-7461 or email  pubaffairs@cfa.harvard.edu.