Why doesn't the sky fall?

[Ed Alt]

Oh heck, they fall alright.  The problem is their coefficient of bounce is too high for them to stay stuck to the dirt when they hit.  These bouncing air molecules are in part responsible for those times when I can't keep my wings level.  True fact!

Ed
  ----- Original Message ----- 
  From: J.Oddino 
  To: discussion at nsrca.org 
  Sent: Monday, August 15, 2005 2:15 PM
  Subject: Why doesn't the sky fall?


  I thought it was time to stir the pot while we wait for the results from the Worlds.
  Can anyone explain why gravity doesn't pull all the air molecules down to earth?  Are they lighter than space?  What is their mean speed?
  I don't think this will help answer the weathervaning question and won't help us fly any better but I thought it might be fun.
  Jim O
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