It is interesting in some ways. However, it involves speculations on things 
we have no knowledge of. 

The idea involves these filters. The one "behind us" involves the barrier 
to intelligent life similar to us. There are few examples of brainy animals 
similar to us. Cetaceans have large brains and clearly their songs contain 
complex information important to them. It is not clear that this is 
equivalent to complex thought such as mathematics. The other filter 
involves post-ET development where such life is limited by either 
self-extermination or the limits of light speed and the unapproachable 
scale of putative interstellar flight.  

I suspect planets with complex life above that of prokaryotic-like life are 
few in number per galaxy. It is hard to know how even prokaryotic-like life 
starts. The ribosome is a complex of RNA with polypeptides, and this thing 
is fairly universal. As yet we are not sure how this came about. So it 
could be that the life bearing planets are already extremely rare. This 
would make planets with complex life most likely very rare, and then up the 
ladder the occurrence of intelligent life exceedingly rare. 

The occurrence of life might be a case of what is called hard emergence. 
Soft emergence is something like the emergence of chemistry from the 
quantum mechanics of atoms. Strong emergence is the occurrence of entirely 
different principles, where this is not an established scientific concept. 
This is of course a completely unknown territory. How life emerged is one 
of the great scientific questions.


On Saturday, February 3, 2018 at 11:21:00 AM UTC-6, John Clark wrote:
>  John K Clark

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