Priya Natarajan, a world-renowned theoretical astrophysicist, is making dark matter maps of clusters of galaxies, the largest known repositories of dark matter in the universe. Her accessible, fascinating book Mapping the Heavens: The Radical Scientific Ideas That Reveal the Cosmos (Yale University Press) chronicles her journey, as well as that of the field of astrophysics which has undergone astronomical changes in recent years. In our interview, which was recorded live at Joe’s Pub at The Public Theater, Natarajan revealed what it’s like to be an outsider in academia, and what it meant to her to watch Carl Sagan as a child, growing up in India.