launch failure during construction and/or to launch a re-supply mission to the colonists. The total launch costs come to $787 600000. (Note: If the existing commercial Atlans-Centaur was used, for example (5 tons to LEO at $59OOOOOO/launch=$ll 800/kg), total launch costs would be $4.01 billion. On the other hand, the Soviet DI booster (Proton) can put 20 tons in LEO, and costs $40000000 per launch ($2000/kg), for a total of $680 000 000. The Chinese CZ-2E ELV has a similar price tag. However, political realities would make it necessary to form some sort of international consortium to be able to purchase these EL Vs). In reality, the project would not want to depend on a sole source for launches, so some kind of mixed vehicle strategy would be used. However, the price tag would remain about the same.
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