Re: New update to that chart
I've added a column to the chart for the approximate diameter of sunlight collector needed for a 10,000 person greenhouse with 1306 hectares of farmland.
Copy & paste the url since nothing else seems to work:
I think we will probably be using sunlight to grow food as long as we stay within our solar system. For a colony orbiting Pluto a solar concentrator 68.8 km wide would be needed, which considering the inherent challenges of the greenhouse itself would probably be a trivial problem. Besides I've read about ideas for solar sails used for propulsion that are much larger than these mirrors.
