From: andromedanews@hotmail.com   
      
   Gene P. a écrit :   
   > I was thiking about terraforming Mars, and how most such schemes call for   
   > big solar mirrors to heat the surface a bit.   
      
   well for Mars , the first thing to do, I think , is to keep the heat   
   from the sun better than bringing more radiation power   
      
   greenhouse gas could be produced and maybe much more efficient to raise   
   planet temperature ... I think this is something realistic   
      
   think that the "sky temperature" above atmosphere is about 3K (-270C)   
   so shielding a bit to prevent radiation losses would probably give good   
   results within decades or centuries   
      
    mirrors may be useful to light or heat spot areas.   
      
   I think I read about 'today s project' to use mirrors to replace night   
   street lights and so... it would use inflatable reflective structures   
   and beam light localy ...   
      
   it would be like a few full moons together ..  would not prevent you   
   from freezing on a parking lot , on a winter night ..   
      
   >   
   > Venus has the reverse problem... WAY too hot.  How much sunlight would   
   > have to be blocked to break the greenhouse loop and reduce temperatures   
   > into the earthlike range?   
   >   
    don t remember well , but I think anything conceivable to change Venus   
   meteo is a matter of thousands/millions years , so Venus ...   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)