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The phasers, tribbles, and moldering Spock ears have long since been crated and returned to their owners. However, the 1992 “Star Trek” retrospective remains the most popular exhibit the Air and Space Museum has ever run, drawing nearly 1 million visitors during its 11-month run. In tonight’s lecture, Mary Henderson, the exhibit’s curator, talks about how this ultimate collection of “Star Trek” memorabilia was assembled and discusses the social milieu that spawned the original TV show. At 7:30 p.m. at the National Air & Space Museum’s Einstein Planetarium, 6th & Independence Ave. SW. $2. (202) 357-2700. (Greg Kitsock)