Podcast Extra: SpaceX v Skylon

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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?