This book presents in one volume a summary of the legal discussion on the definition and delimitation of outer space and the applicable documents in this field. A short survey of the relevant scientific technical aspects is also given. The authors comment on the various positions in the debate from the scientific and technical as well as the legal point of view. They conclude that any agreement should be based not only on scientific and technical information, but also on legal, political, economic and military considerations. This book is unique as this is the first time that the legal, scientific and technical aspects are brought together in one volume. It is of interest to academics and practitioners in the field of outer space.