This book illustrates the relevance of the space environment to science, commerce, and the individual, and explains why we should consider protecting some of its unique properties and most significant territories. Space: The Fragile Frontier is the first book to draw together the recognized issues of Earth orbital debris and planetary protection, set them in the context of space law and ethical policies, and encourage a balance between desirable expansion into space and protection of the space environment. It calls for a sustainable approach to space exploration and development. The book is aimed at scientists, engineers, and policymakers with an interest in space exploration and development, and students who intend to develop a career in a space-related subject.