At the American Museum of Natural History, the Frontiers Lecture “Dark Energy and the Fate of the Cosmos” places a live scientist onstage to talk through one of astronomy’s most unsettled problems: what is driving the universe’s accelerating expansion, and what that implies for its long-term endgame. The format is closer to a public seminar than a show, with big ideas translated into plain language and current evidence. In a city that treats museums as public forums, the series functions like civic programming with a cosmic scale. The sober pace can feel demanding, but that is part of its value.