Erini Lambrides was set on becoming an actor when astrophysics cast her onto a more universal stage. Now she’s a research fellow at NASA and the University of Maryland studying supermassive black holes and the phenomenon called Little Red Dots. These dots are pockmarks in images from JWST that seem to indicate the brief—in universal time—period when these black holes were growing. There are so many of them, she says, that they are rewriting astrophysicists’ understanding of the beginnings of...