This is a cross post of @solar/sol-art-archive-nasa-original-halo-ring-colonies-1975-summer-study-and-more by 
Breathtaking NASA sponsored illustrations on space Colonies
This is a cross post of @solar/sol-art-archive-nasa-original-halo-ring-colonies-1975-summer-study-and-more by
Breathtaking NASA sponsored illustrations on space Colonies