What would be required for a completely self sufficient 1 man habitat?

For the sake of this question, let's say that there would be a space mission that would send one man on a 40 year journey that will require him to be in a completely self sufficient habitat for the duration of the trip. What would be required for him to be completely self sufficient, and not need any external matter or energy?

From what I can come up with, the man would be in a completely sealed spacecraft with near perfect recycling systems that would gather any moisture in the room, and condense it back to water. Life support systems would possibly include genetically engineered varieties of yeast or bacteria in a special ecosystem akin to a winogradsky column,where heat from a nuclear reactor would power thermophile bacteria that would excrete oxygen from carbon dioxide, etc.

Specialized 3D printers would produce any replacement parts for non-essential mechanisms that would break, while automated repair machines and robotics would perform any work. Food for this astronaut could be possibly some sort of Soylent-like material that can be synthesised from yeast or bacteria as mentioned above.

posted about 10 years ago

System‭

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