ABOUT THIS BOOKThe space radiation environment is one of the main limitations of human and robotic exploration of space beyond low Earth orbit. This book presents, in a technical reference and engineering handbook format, the underlying principles, architectures, and integration challenges associated with protecting spacecraft and astronauts from the complex radiation environment of deep space. It is intended to serve as a practical guide for researchers, engineers, and mission planners seeking to understand how and why various shielding approaches function, such as active magnetic fields, passive materials, and bioengineered countermeasures; how they may fail, and how they can be integrated into coherent, mission-tailored protection systems.