This document is designed primarily to describe the U.S. Space Program, its history, its current state of development, and its goals for the future. Chapter headings include: Space and You; The Early History of Space Flight; The Solar System; Space Probes and Satellites; Scientific Satellites and Sounding Rockets; Application Satellites, Unmanned Lunar and Interplanetary Spacecraft; Manned Space Exploration; The Space Launch Vehicles, Biological Considerations in Space Explorations; Astronaut Selection and Training; Rocket Propulsion Principles and Techniques; Electric Power Generation, Guidance, and Communication; and Other Research Activities. The publication is liberally illustrated with photographs, diagrams and tables. (BR)