It is a remarkable achievement to write a book that almost four decades after its publication has lost virtually none of its relevance. Manfred Lachs' famous treatise on the Law of Outer Space was originally published in 1972, yet it is still a classic and must-read text for space law students today, even though copies can nowadays be rarely found. The reissue of this remarkable work is therefore timely indeed. Its aim is to make the brilliance, foresight and clarity of Lachs' thinking once more easily accessible to a new generation of scholars. Issued on the occasion of the 50th anniversary of the International Institute of Space Law, of which Lachs was President, this volume reproduces the original text of Lachs' work in full, with a new preface, introduction and index supplied by the editors.