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I agree heavy servicing in space is not practical yet. Surely a design which gets even only 2 trips out of a spaceship is an improvement on the single trip of the Apollo design. Even this won't be easy as just resupply of food and water in space is not trivial let alone oxygen and rocket fuel. But, if we are serious about regular space travel these are the type of obstacles to be overcome.
It would be easy to say it's too hard and that the physics is against us, but I think there is a solution out there. It may just be that we need to keep incrementally building in space as has been done since the begining.
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