Eric...for some reason, the figure of about  9,000 mph sticks in my head as 
the point of retardation. I don't know where to  resource that figure to 
see if its right or not...but I think its  close.
geozay





>>>>George jut brought up  a  good point and I have a question. The speed 
of 
sound is about  760  MPH.

What is the speed at which a meteoroid extinguishes and is  no longer  
incandescent?>>

I believe its in the  neighborhood of 7,000 mph.  If its a small meteoroid, 
it will  extinguish way too high for a sonic boom to  reach the ground.  
GeoZay  <<<<  

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