example by expert advice through one of the recognized professional scientific institutes or societies. Recommendations: I suggest the following as essential components of a balanced program leading toward satellite power: 1) The vigorous continuation and successful operation of the space-shuttle. 2) Continued development of microwave power transmission, leading toward pilot-model demonstrations here at ground level of phased-array power transmitters as well as planar receivers. 3) Detailed study of the electromagnetic mass-driver, not only as a launching device but for the easier role of high- thrust, high-velocity reaction engines for use outside the atmosphere. 4) Research on earth into long-term physiological effects of oxygen atmospheres and of rotation. Success in these studies could reduce substantially the cost of construction of a habitat for the workforce at an orbital manufacturing facility. 5) Study of continuous-flow chemical processing methods for minerals similar to those found on the moon. 6) Conceptual study of a human-rated version of the LDEF (Long-Duration Exposure Facility): a test laboratory capable of being put into orbit by the shuttle, in which the long-term effects of partial or zero gravity and of various rotation rates could be studied. 7) Studies on earth of high-yield agriculture, under
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