MarkWhittington writes: "NASA engineers at the Marshall Spaceflight Center in Huntsville, Ala., are building a mockup of what appears to be a deep space habitat, though it could also be part of an interplanetary spacecraft. The purpose is to do human factors studies to find out how to sustain astronauts on lengthy deep space missions."
As far as the laws of mathematics refer to reality, they are not
certain, and as far as they are certain, they do not refer to reality.
-- Albert Einstein