The Bigelow Expandable Activity Module (BEAM) is a space station module under development and testing by Bigelow Aerospace, being purchased by NASA for flight to space and attachment to the International Space Station in 2016 [REF].
In early 2011, NASA put forward a conceptual proposal for a long-duration crewed space transport vehicle which includes 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.