The Harvard-Smithsonian Center for Astrophysics (60 Garden Street in Cambridge) will host its monthly Observatory Night on April 21 at 7:30PM on the topic of The Wild West of Star Formation.  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.

And as part of the Cambridge Science Festival, the Center will host Cambridge Explores the Universe on April 23, Noon-4PM, at which space scientists of all ages can drop by to explore the universe through telescope tours, interactive multimedia exhibits, hands-on activities, live demonstrations, and the Scientist Cafe, where visitors can chat with local astronomers.