The NAUTILUS-X is a 2011 NASA proposal for a long-duration crewed space transport vehicle with an artificial gravity space habitat intended to promote crew-health for a crew of up to six persons on missions of up to two years duration. The partial-g torus-ring centrifuge would utilize both standard metal-frame and inflatable spacecraft structures and would provide 0.11 to 0.69g if built with the 40 feet (12 m) diameter option. As of 2011, developing and assembling the NAUTILUS-X ‘would take at least five years and require two or three rocket launches. It would cost about $3.7 billion.’
The Daily Omnivore 
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