Table 1 Priority and timing issues Space transportation reduction of Earth-to-orbit (ETO) launch costs improvement in availability and operations costs for current vehicles preliminary studies for future space transportation vehicles Spacecraft attitude and orbit control and vibration control of large space structures (LSS) efficient radiator systems structural and electrical interfaces for the space-to space antenna and rectenna. development of a deployable phased array structure Power collection conversion and distribution development of more efficient power conversion systems development of high accuracy phase shifter and solid state power amplifier development of both 2.45 and 35 GHz phased arrays Environment, physical, and iife sciences determination of beam effects on biota and the atmosphere on Earth determination of effects of beam on electronics and astronomic observations determination of the risks to astronauts performing experiments Social and Political creation of an international group to manage a space solar power project insure security of satellite and beam creation of an international organization and obtain signatory contributions initiate lobbying at International Telecommunications Union (ITU) for frequency allocation Manufacturing and assembly development of advanced assembly techniques in robotics and Extra Vehicular Activity (EVA) initiate lab studies for in-situ resource utilization (ISRU) development of improved assembly techniques using Space Station Freedom and/or Mir experience Business and other achieve business feasibility for program search for long-term funding achieve scientific acceptance public awareness ensure credibility of organization to perform programs promotion of the space solar power concept raise funding for short and mid term needs gather a core of interested scientist and engineers educate people about energy demand, pollution and alternative source of energy
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