CONCEPT: The Nautilus Long-Duration Spacecraft. “The Nautilus X would consist of a variety of ridged and inflatable modules, solar dynamic arrays, any of a number of mission specific propulsion modules, a manipulator arms, docking ports for Orion or commercial space craft such as the SpaceX Dragon, landing craft for destination worlds and (this is the key) a centrifuge that would simulate partial gravity to maintain the health of the crew for long duration space missions. There would be logistical modules, a radiation mitigation system, facilities for a hydroponic farm, and hangers for landing craft and EVA pods.”