China's Moon mission sees first seeds sprout
To me it seems that the greatest obstacle to space colonization would be maintenance and production of materials and technology needed to sustain and expand the colony. Seems like the last step for truly becoming self sustaining.You'd need extremely small scale factories that can build everything needed for a modern civilization.I wonder what that would take. What the smallest amount of shipments and time would be. Would guess that electronics would be one of the last things you'd learn to make yourself.