From: schillin@spock.usc.edu   
      
   "Bootstrap Bill"  writes:   
      
      
   >"Ash Wyllie"  wrote in message   
   >news:1074.620T1714T12703402@lr.net...   
      
   >> >> Form it into a big hollow sphere, with vacuum in the center. Make   
   >> >> it big enough so that the specific gravity is less than sea level air.   
   >> >> Drop it into Earth's atmosphere, wait for it to sink to ~300m and tow   
   >> >> to where ever.   
      
   >> >Wouldn't the hollow sphere collapse as pressure increases?   
      
   >> Not if it is very round.   
      
      
   >Do we have the technology to build a sphere with a vacuum that is capable of   
   >lifting 200 or more passengers to an altitude of at least 10,000 feet above   
   >sea level?   
      
      
   We do not have the technology to build a sphere with a vacuum that is capable   
   of lifting its own weight at sea level.  And we aren't going to get it any   
   time soon.   
      
      
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