sion, environment and macroengineering. There were 104 lectures and a poster session. Themes extended over a broad cross-section of SPS including SPS demonstration plans, research on basic technologies, energy and environment on a global scale, and nuclear fusion using helium on the moon (Fig. 2). On the final day, a round-table conference was held on international cooperation, and many opinions voiced Fig. 2 Concept of solar power satellites on the trends of SPS R&D as well as the importance of international cooperation. An American private enterprise researcher suggested that the outlines of international cooperation on SPS research should be decided immediately. In fact, the SPS is a massive, ambitious undertaking involving many formidable technical problems such as how to build the massive structure and how to transport it into outer space. These matters cannot be solved by a single country due to the lack of researchers and funds. In addition, the benefits of SPS commercialization should be enjoyed by all countries, and not only by Japan or any other single country. Therefore, research on SPS should be advanced from the initial stage under close liaison and cooperation among SPS and energy researchers worldwide. (Source: SPS '91 Proceedings I. Bekeg)
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