Some time ago I sent the following message:    Every once in a while I design an orbital space colony.  I'm gearing up to    do another one.  I'd some info from you. If you were to move    onto a space colony to live permanently, how big would the colony have    to be for you to view a permanent move as desirable?  Specifically,     How many people do you want to share the colony with?       What physical dimensions does the living are need to have?        Assume 1g living (the colony will rotate).  Assume that you can leave    from time to time for vacations and business trips.  If you're young    enough, assume that you'll raise your children there.  I didn't get a lot of responses, and they were all over the block. Thanx muchly to all those who responded, it is good food for thought.     Here's the (edited) responses I got:      How many people do you want to share the colony with?   100     What physical dimensions does the living are need to have?    Cylinder 200m diameter x 1 km long  Rui Sousa ruca@saber-si.pt  =============================================================================  >   How many people do you want to share the colony with?  100,000 - 250,000  >   What physical dimensions does the living are need to have?    100 square kms surface, divided into city, towns, villages and countryside.  Must have lakes, rivers amd mountains.  =============================================================================  > How many 1000.  1000 people really isn't that large a number; everyone will know everyone else within the space of a year, and will probably be sick of everyone else within another year.  >What physical dimensions does the living are need to have?    Hm.  I am not all that great at figuring it out.  But I would maximize the percentage of colony-space that is accessible to humans.  Esecially if there were to be children, since they will figure out how to go everywhere anyways. And everyone, especially me, likes to "go exploring"...I would want to be able to go for a walk and see something different each time...  =============================================================================  For population, I think I would want a substantial town -- big enough to have strangers in it.  This helps get away from the small-town "everybody knows everything" syndrome, which some people like but I don't.  Call it several thousand people.  For physical dimensions, a somewhat similar criterion:  big enough to contain surprises, at least until you spent considerable time getting to know it.  As a more specific rule of thumb, big enough for there to be places at least an hour away on foot.  Call that 5km, which means a 10km circumference if we're talking a sphere.                                           Henry Spencer at U of Toronto Zoology                                           henry@zoo.toronto.edu   utzoo!henry  ============================================================================= My desires, for permanent move to a space colony, assuming easy communication and travel:  Size:  About a small-town size, say 9 sq. km.  'Course, bigger is better :-) Population:  about 100/sq km or less.  So, ~1000 for 9sqkm.  Less is better for elbow room, more for interest and sanity, so say max 3000, min 300.  -Tommy Mac ------------------------------------------------------------------------- Tom McWilliams | 517-355-2178 (work) \\     Inhale to the Chief! 18084tm@ibm.cl.msu.edu  | 336-9591 (hm)\\  Zonker Harris in 1996!