does not seem unreasonable, there is assumed to be some technological or economic risk in planning to use these materials. A special case is nickel, which is a component of some micrometeorites. Though present in only tiny amounts in lunar soil, these micrometeorites are high quality steel and should be easy to separate magnetically from the soil.(7) Thus, using nickel steel is assumed to be a reasonably good risk. 1.1 SUMMARY OF RESULTS This section presents the broad, satellite-level results of the study, followed by technical results for each major satellite system. It is found that an SPS can be designed which uses less than one percent as much non-lunar material as the Earth baseline SPS, a factor of ten improvement over the results of the General Dynamics study. The total mass of the system is about eight percent greater than that of one made from Earth-derived materials. The best design uses silicon photovoltaic cells for power conversion. Its structure is primarily aluminum and uses aluminum oxide coatings for thermal control. Radiators are more than 99 percent composed of lunar material. A flywheel system is used for energy storage during eclipses. The design is suitable for largely automated construction. FIGURE 1.1-1, TOTAL MASS TO NON-LUNAR MASS COMPARISON
RkJQdWJsaXNoZXIy MTU5NjU0Mg==