additional communities and products such as satellite solar power stations. • To rely only on those technologies which are available at the time. Section 1 outlines the general concept and physical configuration of the proposed system. Section 2 is devoted to the considerations of transportation between earth and moon and the various orbits that are utilized in the concept. Section 3 surveys the manufacturing and assembly operations that are to be carried out in space. Cost estimates are considered in Section 4 and the development program necessary to make the concept operational is treated in Section 5. 1. Physical Configuration Four models have been proposed for the space colonies with Model 1 being the smallest, simplest and first to be built. Model 4 is the ultimate community. Each colony consists of two gigantic cylinders with their longitudinal axes always pointed toward the sun. Each cylinder rotates slowly, in opposite directions, to provide gravity and stability. The cylinders are divided into alternating strips of land area ("valleys") and window area ("solars") running the entire length of the cylinders. Insolation is controlled by means of mirrors to approximate that experiended on earth. Basic dimensions of each of the cylinders in the four models are: Model _______ Length_____ Radius____ Period Miles Kilometers Feet Meters Seconds 1 0.62 1.0 320 100 21 2 2.0 3.2 1000 320 36 3 6.2 10 3200 1000 63 4 20 32 10000 3200 114 The entire Model 1 colony (i.e., both cylinders) will have a population of 10,000 people. Model 2 will provide for 100,000 to 200,000 people and Model 3 will have up to 2 million people. The population of a Model 4 colony is projected to range from 200,000 to 20 million inhabitants. To build the first Model 1 colony, a modified space shuttle and
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