In 1996 Colin Gray asked ‘where is the theory of space power? Where is the Mahan for the final frontier?’1 This book answers that question by presenting propositions of spacepower and a strategic analogy of Earth orbit as a cosmic coastline. This book’s spacepower theory shows how to think more constructively and critically about the use of space systems in warfare – satellites, their infrastructure, methods of attacking them, and their influence on modern warfare and strategy. Spacepower theory helps to answer questions like ‘will a war begin or be decided in space?’, ‘how do satellites change the way war is conducted on Earth?’ and ‘what difference can space warfare make on Earth?’ Engaging with these questions has never been so important, as the use and deployment of satellites and space infrastructure – or spacepower – have become essential for modern military and economic power. It underpins and shapes a global web of connectivity and information-based economies. It provides new methods of political–economic development and control for continent-sized states. Space warfare is a realistic prospect because space technologies are at the heart of military weapon systems, intelligence, logistics and economics, and the tools for harassing or disabling satellites are spreading. In short, spacepower and the spectre of space warfare cannot be ignored in international relations (IR) and modern strategy. Spacepower represents a logical extension of the concept of power – however defined – in IR and it ‘consists of capabilities designed to control, deny, exploit, and regulate the use of space’....