The book contains a series of essays, the published proceedings of The Conference on Interstellar Migration that took place in 1983 at Los Alamos. Now three decades in the past, many of the perspectives are somewhat dated. However, the core physics and essential social questions remain potent. The essays consider not just the technological hurdles of human colonization of space, but the myriad sociological, ethical, biological, and psychological challenges as well. The essays look to the past for anthropological models on which to base future projections of individual and large-scale human behavior under novel circumstances.