Fig. 1-3. Solar Turbomachine Power Satellite Option per kWhr, all significant elements of the program must also be appropriately low in cost. This includes not only the power generation and transmission systems, but also the systems used for space transportation and space assembly. These auxiliary systems were of necessity considered in this study although their investigation was not a primary goal. An example of an auxiliary system is the heavy lift launch vehicle ("space freighter") used to transfer SPS material to low orbit. It is shown in Figure 1-4 during the landing phase; a portion of the ascent propulsion system is used to Fig. 1-4. "Space Freighter" Lands
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