From: matalog@ntlworld.com   
      
   Re-entry must be much faster than launching.  It would make sense that it   
   would be - and the higher speed causes the extreme temperatures.  It's the   
   speed at which you travel through the atmosphere that leads to the high   
   temperatures.   
      
      
      
      
      
    wrote in message   
   news:1122575549.091205.19130@f14g2000cwb.googlegroups.com...   
   > I think I understand why objects heat up when going through the   
   > atmosphere and therefore why re-entry vehicles need heat shielding.  My   
   > question is why we don't need heat shielding when launching.  Aren't we   
   > going through the same atmosphere?   
   >   
   > BigKhat   
   >   
      
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