Nautilus-X is a multi-mission space exploration vehicle imagined by the Technology Applications Assessment Team of NASA.
The spacecraft was designed for long duration (one to twenty-four months) exo-atmospheric space journeys for a six-person crew. In order to limit the effects of microgravity on human health, the spacecraft would be equipped with a centrifuge.
Nautilus-X stands for Non-Atmospheric Universal Transport Intended for Lengthy United States Exploration.