“Beautifully written, Starlight Detectives reminds us how the wonders of the modern universe would never have been possible without the ingenious advances made by pioneering scientists in the nineteenth century. They were the ones who first learned how to read the messages hidden within a star’s radiations. With his poetic eye on the nighttime sky, Alan Hirshfeld engagingly shows how science arrived, step by step, at its revolutionary discovery that we live in but one galaxy amid multitudes flying outward in an expanding universe. A must-read for astronomy and history of science aficionados alike.”