Since one month passes after this, while the asteroid is de-spun before large mass driver reaction engine construction begins, and the first 3 months after the space manufacturing facility is attached to the asteroid were spent producing the space manufacturing facility which is sent to the second asteroid, the return begins at month During return, the space manufacturing facility produces 104 space manufacturing facilities for use on other asteroids, and 104 mass driver reaction engines to transport them. Each of the 104 space manufacturing facilities will be produced by a corresponding space manufacturing facility during the three months required for selfreproduction. The mass driver reaction engines will be constructed simultaneously by other space manufacturing facilities. The miniminn time before departure of the space manufacturing facilities and mass driver reaction engines occurs when 4 more generations of the space manufacturing facilities are produced before the construction of the space manufacturing facilities and mass driver reaction engines to be sent out is begun. Self-reproduction of the additional generations begins when the large mass driver reaction engines are complete. When the 4 additional generations are complete there are 2^ = 32768 space manufacturing facility copies, so 32768 - 10000 = 22768 space manufacturing facilities are available for the mass driver reaction engine construction. Since the rate of mass driver reaction engine construction is 32.2 t I (mo. s.m.f.), the rate of mass driver reaction engine construction is which is the same time required to complete the 104 space manufacturing facilities. Both therefore are complete and leave the asteroid at month 54 + (4 • 3) + 3 = 69. It was assumed that the average AV to the 104 new asteroids is 9.4 km/s; more precisely, this will be interpreted as stating that the distribution of AV to the 104 asteroids is such that the average of the reaction mass provided to each mass driver reaction engine is that required for a AV of 9.4 km/s. Therefore, the reaction mass averages 100 t as in the initial trip from low earth orbit to the first asteroid. The total mass removed from the asteroid for the 104 space manufacturing facilities and mass driver reaction engines and reaction mass for each is therefore
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