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For those of you not dying for Tuesday’s season premiere of Buffy the Vampire Slayer, check out a different kind of darkness, at the core of our very own galaxy. Join UCLA astrophysicist Dr. Andrea Ghez (Discover magazine calls her one of “Twenty Scientists to Watch in the Next 20 Years”) for her lecture “Discovering a Black Hole at the Center of the Milky Way.” With the aid of powerful telescopes, Ghez has observed stars traveling at unusually high velocities around the galactic center, indicating the presence of a strong gravitational pull from a black hole, a dense object much more massive than the sun. Tonight, she’ll tell us why we don’t get sucked into the void. In conjunction with the lecture, Neelon Crawford’s photography exhibit, “Tools of Vision,” depicts real-life superpower telescopesthese babies look more far-out than any Hollywood sci-fi movie prop. At 7 p.m. at National Academy of Sciences Auditorium, 2100 C St. NW. Free. (202) 334-2439. (Liz Eckstein)