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Bob S
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Astronauts spending any significant time on the Moon, and later on trips to Mars, will need to synthesize C6H12O6 and other sachharides for food. Is there any other way then using photosynthesis, using either sunlight or artificial light? Where does most of the CO2 for photosynthesis come from; from the spaceship air, urine, or feces? Will plants be the primary way for removing CO2 from the air? Is there any food-related protein, vitamin, or mineral that is not available by recycling waste? Is there a better photosynthesis cycle than the Calvin cycle? See
http://en.wikipedia.org/wiki/Calvin_cycle
Bob S
http://en.wikipedia.org/wiki/Calvin_cycle
Bob S