  As the space industry matures, large space stations will be built. This paper
organizes and documents constraints on the size of these space stations. Human
frailty, station design, and construction impose these constraints. Human
limitations include gravity, radiation, air pressure, rotational stability,
population, and psychology. Station design limitations include gravity,
population, material, geometry, mass, air pressure, and rotational stability.
Limits on space station construction include construction approaches, very
large stations, and historic station examples. This paper documents all these
constraints for thoroughness and review; however, only a few constraints
significantly limit the station size. This paper considers rotating stations
with radii greater than 10 kilometers. Such stations may seem absurd today;
however, with robotic automation and artificial intelligence, such sizes may
become feasible in the future.
