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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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