The author begins by describing how the very latest rocket propulsion and spacecraft technology, and planned developments in nuclear and electric propulsion technologies, are the key factors which will enable a human expedition to Mars to take place. Of particular importance are the challenges of transporting cargo to Mars and in providing necessary life support for the crew, including the supply of consumables, such as food, water, air and fuel, for the return journey. In this regard the author considers how the International Space Station fits into the strategy for a human journey to the Red Planet, in its preparation of astronauts for long-duration spaceflight and the possible hazards posed by space radiation and prolonged weightlessness. He concludes by looking at the possible political obstacles to such a journey, but points out that sooner or later humans will have to make a choice; stay here on Earth or explore the Solar System beyond.weiterlesen