Starring Kirsten Dunst, Charlotte Gainsbourg and Kiefer Sutherland, Lars von Trier’s 2011 film “Melancholia” tells the story of two sisters who find their already-strained relationship challenged as a mysterious new planet threatens to collide with Earth. Peter Szendy, professor of humanities and comparative literature, gives a short introduction. Marcuvitz Auditorium, Sidney E. Frank Hall, 185 Meeting Street.