The universe should be teeming with life, so where is everybody? This mystery is known as the Fermi Paradox. Corey S. Powell and George Musser, two award-winning science journalists, search for answers. We interview top astronomers, philosophers, and science-fiction creators. We run down every possibility, from alien artifacts on the moon to signals from deep space. And we prepare for the possibility: If we make contact, how will we talk to an alien civilization? Every step of the way, Powell and Musser bring a skeptical eye to the subject, while celebrating the vast unknowns of the universe.