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RE: (meteorobs) Tunguska bolide & Beta taurid stream



exceld77 wrote:

>Just some thoughts about some arguments:
>>POINTS IN FAVOUR OF A METEORITIC ORIGIN (Sekanina)
>>1) The majority of evidence points to only one explosion - so no
>>fragmentation earlier in its flight.

>Should a piece of cometary material necessarily break up during its flight 
through the atmosphere? I'm >not sure if this is the best example, but 
Leonids and Perseids are of cometary origin and I haven't seen >any break 
up, they often end with a terminal explosion though.

A large cometary fragment composed of dust,  grit and gravel in a matrix of 
 ices may not have the structural strength required to withstand the 
dynamic forces of entry as do the individual dust, grit and gravel pieces 
we see entering the atmospheric during meteor showers.  Gravity alone is 
sometimes sufficient to break up a comet during its passage by a planet or 
the Sun:  that illustrates that some comets, at least, are structurally 
weak.

George Kelley




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