One of the most powerful questions we ask about the cosmos is: Are we alone? The Possibility of Life traces the history of our understanding of what and where life in the universe could be, from Galileo and Copernicus through to our current tracking of exoplanets in the Goldilocks zone, where life akin to ours on Earth might exist. Along the way, Jaime Green studies insights from a long tradition of science fiction that uses imagination to extrapolate and construct worlds, in turn inspiring scientists and their research. Bringing together expert interviews, cutting-edge astronomy, philosophical inquiry and pop culture touchstones ranging from A Wrinkle in Time to Star Trek, The Possibility of Life delves into our evolving conception of the cosmos to pose an even deeper question: what does it mean to be human?