'War in Space delivers groundbreaking insights using traditional continental sea power theory as a template for strengthening space power theory. The largest contribution to space power thought in a generation, Bowen's seminal ideas are destined to inform wide audiences and guide our way ahead as space becomes increasingly contested and the USA stands up its Space Force.' Peter L. Hays, Space Policy Institute, George Washington University Applying strategic theory to outer space and drawing out the implications for international relations This book presents a theory of spacepower and considers the implications of space technology on strategy and international relations. The spectre of space warfare stalks the major powers as outer space increasingly defines geopolitical and military competition. As satellites have become essential for modern warfare, strategists are asking whether the next major war will begin or be decided in outer space. Only strategic theory can explore the decisiveness and effects of war in space upon 'grand strategy' and international relations. The author applies the wisdom of military strategy to outer space and presents a compelling new vision of Earth orbit as a coastline, rather than an open ocean or an extension of airspace as many have assumed. Rooted in the classical military works of Clausewitz, Mahan and Castex to name a few, this book presents comprehensive principles for strategic thought about space that explain the pervasive and inescapable influence of spacepower on strategy and the changing military balance of the 21st century. Bleddyn E. Bowen is a Lecturer in International Relations at the University of Leicester.