Book excerpt: This full-color textbook will help students and professionals understand the space environment and its impacts on spacecraft design, engineering, and performance. While the primary emphasis of the book is the Earth's environment and its effects on spacecraft, it also addresses the extraterrestrial environment and the effects of radiation on humans in space. The book begins with an introduction to the history of spacecraft failures, risk management reliability and quality assurance techniques, and parts reliability. It goes on to provide an overview of the structure of the Sun: the structure, origin, and models of the geomagnetic field; gravitational field of the Earth; Earth's magnetosphere and radiation environment; neutral environment including fundamentals of the kinetic theory of gasses; variation of pressure with altitude and hypoxia of humans; electromagnetic propagation; the effect of atomic oxygen of materials; plasma surrounding the Earth; transport and effects of photon