A thousand years from now, our epoch will be remembered as the time when we first left the Earth and saw it from beyond the outermost planet as a pale blue dot, almost lost against the backdrop of the stars. As we complete the preliminary reconnaissance of our Solar System, we hunger for a long-term vision of the human future. Now, the astronomer who brought the Universe to so many people answers that call—suggesting that our very survival depends on the exploration and settlement of other worlds. Pale Blue Dot reveals how science has revolutionized our understanding of where we stand and who we are and challenges us to weigh what we will do with that knowledge. Emerging out of our sometimes reluctant recognition of our true place in the Cosmos comes a vision of an exhilarating future with a surprisingly spiritual impact.