Find the best The Lightest Element play tickets at Hampstead Theatre, Inner London. Boston, 1956. Cecilia Payne-Gaposchkin, one of the most eminent astronomers of the twentieth century, is about to be appointed Chair of Astronomy and the first woman to head a Harvard department. Only two things stand in her way: a covert investigation aimed at exposing her as a communist sympathiser, and the entrenched conservatism of her male colleagues. When a student journalist asks to profile her it feels like an opportunity to control her own narrative - assuming, of course, that the invitation is actually what it seems... World Premiere.