E. Key Considerations and Areas for Further Investigation ................................................................... VII-14 1. Prelaunch, Launch, and Recovery Operations ................. VII-14 2. Space Manufacturing and Construction Options ............. VII-15 3. Operational Space Control Operations ........................... VII-15 4. Simulation and Training Operations .................... VII-15 5. Safety in SPS Operations ............................................... VII-16 VIII ENVIRONMENTAL CONSIDERATIONS .............................. . ................. VIII-1 A. Methodology ............................................................................ VIII-1 B. Environmental Questions ........................................................ VIII-1 C. Comparisons with Conventional Systems ................................. VIII-2 IX MANUFACTURING CAPACITY, NATURAL RESOURCES, TRANSPORTATION, AND ENERGY CONSIDERATIONS ................................................. IX-1 A. Requirements......................................................................... IX-1 B. Manufacturing Capacity ........................................................ IX-1 C. Natural Resources .................................................................. IX-1 D. Surface Transportation ........................................................ IX-1 E. Energy Payback...................................................................... IX-3 X PROGRAM DEVELOPMENT PLAN ............................................................. X-l A. Program Phasing...................................................................... X-l B. System Definition and Exploration Technology Phase .... X-l C. Technology Advancement Phase .............................................. X-6 D. System Development ............................................................... X-7 E. Program Costs......................................................................... X-7 XI PROGRAM COST AND ECONOMIC ANALYSIS............................................. XI-1 A. Methodology............................................................................. XI-1 B. SPS Costs................................................................................ XI-1
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