Why doesn't the sky fall?

[Larry Caldwell]

I think the air starts to get mean at about 70 mph.  Unless you are 
landing your plane, then it's less that that.

Larry Caldwell

J.Oddino wrote:
> 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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