Ultimately, we need to figure out what is next for humanity. Our logical move is to break free of the confines of the Earth and colonize another body in the Solar System, such as the Moon or Mars. How and when will we do this? Or is it all just science fiction? These questions, in a nutshell, make up the core of astrobiology--the study of the origins and evolution and biology of life elsewhere in the universe, and the search for it. This book is an accessible introduction to the most fascinating question of all the astro-sciences--are we alone in the Universe?