Toroid

In 1976, NASA Administrator James Fletcher noted that "The question, 'What is feasible?' can be finally answered only by future historians." He was talking about the elaborate plans for space habitats the agency had spent a summer noodling over, but the same remark could have been made to the incredulous before the first moon landing, for example -- or before the birth of transoceanic voyages in the 14th and 15th Centuries. So begins of one of my favorite pieces of utopist NASA detritus, a document called Space Settlements: A Design Study, made over the course of a 10-week workshop at the…