One of the greatest adventures in the future of humanity will be to construct, work, and live in space based structures. In this book we look at the history of ideas for living in space, proposed space colony designs, and technology. This book is updated for 2023 with lots of new chapters and information which will all affect the building of space colonies. The details of current life support technology on the International Space Station is reviewed, and what technologies will be required for development of large scale space colonies. What other things in terms of financing and materials availability will be also needed? And who are the innovators providing new space technologies which will be used going forward to build space infrastructure. Finally, we conclude with some recommendations to get us ready to build these colonies. The Table of Contents Includes: 1.0 Introduction 2.0 Realities and Reasons 3.0 The History of Space Habitats 4.0 Major Proposed Space Habitats The Rotating Wheel O'Neil Cylinders The Stanford Torus The Bernal Sphere Kalpana One 5.0 Fringe Technologies 6.0 Space Environmental Issues Radiation Protection Heat and Cold Fresh Water Breathable Atmosphere Waste Elimination Power Systems Food Production Atmosphere Guidance and Control 7.0 Financial & Other Incentives Government Vs Free Enterprise Space Tourism Space Manufacturing Mars Settlement 8.0 The Deep Space Gateway 9.0 New Space Stations and Those Being Planned The Chinese Tiangong Space Station Orbital Reef Starlab Concept for a Huge Chinese Space Station 10.0 5-15-Years Bases on the Moon 11.0 5-15 Years-Hotels in Orbit 12.0 15-40 Years-Mars Colonies 13.0 Space Infrastructure Development Reduced launch costs Robotic Construction Three Dimensional Printing Solar Smelting Propulsion Systems Nuclear Propulsion Solar Electric Propulsion Ion Propulsion The EM Drive 14.0 Leaders in New Technologies Space X-Rocket History SpaceX's New Starship Rocket Blue Origin's Rockets DreamChaser Artemus Moon Landers Planetary Resources-Asteroid Mining 3D Printing companies Relativity Space's New Printed Rocket 15.0 Materials for Construction Mining the Moon Asteroid Mining Space Elevators 15.0 50-100 years-Habitat Cylinders Habitat Phase 1-Getting Started Habitat Building-The Early Years Redwood Forest-Building the Inside Construction Continues Permanent Residency Living in Redwood Forest for Five Years Bora Bora Two 17.0 75-150 years-Asteroid Homes My Secret Hideaway 18.0 1000+ years Very Large Structures 18.1 Ringworld Structures Establishing Gravity Managing the Sun Impossible Strength? From Worlds to a Ringworld 18.2 Dyson Spheres Dyson Spheres, Swarms, and Bubbles Dysonian existence 19.0 Long Term Planning 20.0 Summary 21.0 Bibliography 22.0 Index