Space satellites have become strategic assets and valuable military targets. China has vowed to become the world's leading space power by 2045. In 2019 it landed its Chang'e-4 lunar probe on the far side of the moon - something which had never been done before. The US air force secretary said, ‘China has moved aggressively to weaponise space. Conventional deterrence and operations depend on access to communications, intelligence, and other services provided by space-based systems. As a result, China has pursued and fielded a number of weapons systems in space designed to defeat or destroy America's space-based military weapons systems and ability to project power.’ Much of what happens in space affects life on earth. The 3,000+ active satellites orbiting earth today and their services have become indispensable. Among these are US military-operated GPS satellites for positioning, navigation and timing, serving military and civilian needs - for example taxis, grocery delivery services, monitoring weather, and communications.