XPost: rec.arts.sf.science   
   From: bap@shrdlu.com   
      
   In message <412b8388.214868310@news.eircom.net>, Russell Wallace   
    writes   
      
      
   >   
   >Is there any way to change that (I mean, reasonable ways, i.e. without   
   >expending propellant or using huge gyroscopes etc)? For example,   
   >Earth's axis precesses every 26,000 years IIRC; how does that square   
   >with conservation of angular momentum? Is there a way a habitat's axis   
   >could be made to "precess" through a full circle every year?   
      
   Although it lacks elegance there's no reason why you can't continually   
   expend propellant. If there's any industry on the colony it is likely to   
   use some form of raw material and produce some sort of waste. If the   
   industry uses asteroidal material then it may produce silicon as a   
   waster material. Given enough energy that could be used as a propellant.   
      
      
      
      
   --   
   Bernard Peek   
   London, UK. DBA, Manager, Trainer & Author. Will work for money.   
      
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