In the vein of Randall Munroe's What If? Books, movies and television shows proliferate that attempt to answer this question and explore it. Michael Wall treats that question as merely the beginning, touching off a wild ride of exploration into the final frontier. Would they be little green men or mere microbes? Would they be found on a planet in our own solar system or orbiting a star far, far away? Would they intend to harm us, and if so, how might they do it? And might they already have visited? OUT THERE is arranged in a simple question-and-answer format.