From: DavidEPugh@hotmail.com   
      
   "LRW"  wrote in message   
   news:3a1d1813.0406210740.467d250d@posting.google.com...   
   > Now, correct me if I'm wrong, but didn't the commercial SpaceShipOne   
   > reach the very edge of the atmosphere? Doesn't it also need the   
   > observe the same careful considerations for reentry?   
   > If not, why? In simple "Physics for English Majors" language. =)   
      
   Basically, SpaceShipOne was not moving all that fast when it left the   
   atmosphere. If something is in orbit, it is moving around Mach 25 (compared   
   with SSO's top speed of less than Mach 3).   
      
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