NASA won the space race against the Soviets to become the first to set foot on the moon 50 years ago. But the business of building space rockets looks very different today. Countries and continents including China, India and Europe are challenging US space agency NASA’s hegemony. And three major private players now rule the space exploration and tourism sector. These are Richard Branson’s Virgin Galactic, Jeff Bezos’s Blue Origin and Elon Musk’s SpaceX.