A second major problem is maintaining astronauts' mental health. being confined for long periods of time in dark and hostile space undoubtedly produces anxiety. loneliness and boredom are psychological concerns.
finally,how can astronauts "let off steam" when interpersonal conflicts develop? even best friends can irritate each other when forced to spend weeks together in isolation. space station are small, cramped,busy workplaces,and there is little privacy. also,space exploration is dangerous,which adds to the stress aboard a spaceship.