3. As will be shown, the construction of these vehicles is complete before the asteroid and habitats reach final orbit. The round trip time for these vehicles before high earth orbit is reached is one year maximum; one year will be the time used here. The vehicles depart as soon as complete, are loaded with plants and some animals, then returned to the habitats, where this stock is introduced immediately. As will be shown, this is before the habitats reach their final orbit. 4. Once the asteroids reach their final orbit, they are spun to provide simulated gravity of 1 g, and paired to yield zero total angular momentinn. It will be assumed this takes one month. Because the habitats may not have rotation rapid enough to provide 1 g during the return, and their alignment with respect to the sun during return may differ from the final alignment, the life support capacity will be less than when they are positioned in final orbit, spun, and paired. 5. After being spun and paired, their operation is observed for one year before humans begin habitation. 6. The human population density in the habitats averages one person per 20235 m2. Scheduling The mass driver reaction engine and space manufacturing facility leave the first asteroid at month 9 + 8 + 3 = 20. It takes 8 more months to reach the second asteroid, so the space manufacturing facility is attached to it and begins self-reproduction at month 20 + 8 = 28. The number of large mass driver reaction engines required to return the asteroid is proportional to the mass of the asteroid, since the same AV, maximum acceleration, and time are required to move the second asteroid as the first to high earth orbit. Since 205 large mass driver reaction engines were required for the first asteroid, with mass 10$ t, are required for the second asteroid. The total mass of these large mass driver reaction engines is The minimum time until completion of the large mass driver reaction engines is reached at the 25th generation, when the rate of construction is 22^ • 32.2 t / mo. = 1.08 x 10$ t / mo., so the large mass driver reaction engine construction takes
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