Download Episode! The full length discussion between Ralph & Paul about the merits of rockets against spaceplanes - the risks, costs and current availability of technology. With Elon Musk's SpaceX committed to landing expendable rocket parts and Reaction Engines' Sabre Rocket being backed by ESA and the UK Space Agency, is the future of spaceflight along NASA's disposable rocketry lines, SpaceX's resusable rockets or Skylon spaceplanes?