= 3.3IxlO91, and its shielding mass is 80.7 x 3.93 x 108 t = 3.17xlO10 t. The shielding can be placed inside the structural mass. Additional mass is required to provide the habitat with soil, vegetation, and housing, yielding a total mass of 10 t. The volume contained by the habitat, including hemispherical ends is The partial pressure of N2 is 78.08% in the earth's atmosphere. If the atmospheric temperature is 296 K, the mass to fill a given volume is a factor 273 K / 296 K = 0.922 less than at standard temperature and pressure, so the mass of N2 is The ratio of the mass of N in the habitat to the total mass of the habitat is therefore 1.05 x 109 t / 10^ t = 0.0105; to prevent waste, only asteroids with at least this N concentration are used. Habitat Construction from Asteroidal Resources with Pure Self-Reproduction and Construction in Low Earth Orbit Assumptions Habitat construction is based on the plan for asteroidal resources with pure self-reproduction and construction in low earth orbit, and produces the largest possible habitats, discussed above. However, the plan for asteroidal resources with pure self-reproduction without construction in low earth orbit could also be used, and the schedule in this case will also be given. The schedule for a plan in which habitats are constructed without solar power satellite construction will also be given here. Assumptions are 1. The habitats are constructed as soon as possible. It will be shown that they are complete, except for pairing and spinning, before the asteroid from which they are constructed reaches its final high earth orbit. 2. After completion of habitats during return as above, the space manufacturing facilities construct vehicles which will be used to bring humans, animals, plants, and baggage from earth to the habitats. Fuel and the material for the vehicles is entirely from the asteroids.
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