used, humans enter the habitats at month 167 - 11 = 156 = 13 yr., 0 mo. If low earth orbit construction is used, humans enter at month 172 - 11 = 161 = 13 yr., 5 mo. However, this assumed the 104 space manufacturing facilities and mass driver reaction engines were constructed at some time after asteroid return is begun. In order for these to be sent out as soon as possible, in the following it will be assumed that they are constructed at the completion of generation 15, as in the case of the return of the asteroid for use in construction of solar power satellites. As before, the construction takes 3 months. Since it takes place before the return begins, and self-reproduction resumes as soon as the construction is complete, the beginning of the return of the asteroid is delayed 3 months. In the case in which low earth orbit construction is not used, humans enter the habitats at month 156 + 3 = 159 = 13 yr., 3 mo. If low earth orbit construction is used, humans enter at month 161 + 3 = 164 = 13 yr., 8 mo., Population Capacity per Habitat and Total Capacity End caps will not be considered in determining habitable area. Since the area of the habitat is half windows, the habitable area is The population of each habitat is The 1012 t asteroid therefore supplied habitation for 8 times this many, or 127184. Assuming that the average mass returned per asteroid for the 104 space manufacturing facilities and mass driver reaction engines that were sent out is the same as for the 10*2 t asteroid, the total resulting capacity is 104 • 1.27x10^ = 1.27x10$ humans, and area constructed is 104 ■ 8 • 321.7 km2 = 2.57 x 107 km2. If enough asteroidal material is available to repeat this, the resulting population capacity is 1.27 x 1012 humans, and area constructed 2.57 x 101 km2 Summary of All Times In the following summary, the times noted for the extended S.S.I. plans are those for the arrival of the first group of 16 solar power satellites at geosynchronous orbit. The times and plans are listed in the order in which they were discussed. Abbreviations used in names of the plans are Habs. - Habitats L.e.o. - Construction in low earth orbit by the space manufacturing facility. Pure - Pure self-reproduction. S.P.S. - Solar power satellites. No l.e.o. - No construction in low earth orbit by the space manufacturing facility.
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