From: henry@spsystems.net   
      
   In article <1107292375.807277.139820@z14g2000cwz.googlegroups.com>,   
   Cray74@gmail.com  wrote:   
   >> I know plastic at exremely low temperatures is extremely brittle.   
   >   
   >Only if you use the wrong plastic. Some plastics behave very well at   
   >cryogenic temperatures...   
      
   Besides, this is irrelevant.  Any structure meant for human habitation   
   will *not* reach cryogenic temperatures anywhere.  There'll be insulation   
   on the outside -- you want the insulation external, because that lets you   
   use MLI, which is superb insulation but works only in vacuum -- and the   
   structural shell will never be much colder than room temperature.   
      
   Space is *not* cold.  It has no temperature.  The average temperature of   
   an object in Earth orbit, assuming no special measures are taken, is   
   rather Earth-like.  After all, a nice warm Earth fills half the sky.   
   --   
   "Think outside the box -- the box isn't our friend."    |   Henry Spencer   
                                   -- George Herbert       | henry@spsystems.net   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)