On March 27, 2024, the New York Times published an obituary for Henrietta Leavitt, the discoverer of the period-luminosity relation for Cepheid variable stars. Using this relation, astronomers were able to discover that the universe was much bigger than originally thought. This obituary is part of the Overlooked effort of the New York Times to publish obituaries of notable persons who were overlooked by the newspaper at the times of their deaths. All modern astronomy textbooks contain a section about this important discovery.