Author(s): Murphy, Thomas W, Jr | Abstract: Note: a two-side version optimized for printing is available in Supplemental Materials. Where is humanity going? How realistic is a future of fusion and space colonies? What constraints are imposed by physics, by resource availability, and by human psychology? Are default expectations grounded in reality?This textbook, written for a general-education audience, aims to address these questions without either the hype or the indifference typical of m...| escholarship.org