...Absence of Proof is not Proof of absence,...
Agreed.
So just show one single planet that has life of any kind, let alone intelligent life. There aren't any. And lord knows we have spent enough time looking.
Probability suggest there should be thousands. But once again the theory runs ahead of the experimental proof. And all physics theory need to be supported by experiment. Or they are just conjecture.
I have a work mate from south Africa, he is a religious nut and an Alien denier.
He asked the same question.
So, I went home and did the math.
I scaled the size of the known universe to the distance between his house in South Africa, and our work in Victoria Australia
I then looked at our first radio emissions?? 110 year ago ?? and scaled it onto the map.
If our first radio emissions headed out across the universe, it had traveled if I remember something like 1.5mm from Melbourne to South Africa. I scaled it up to a civvilization that has not nuked itself for 10, 000 years and it was omething like 1 meter.
So Seti is looking for a signal that even for a 10,000 year old civilization has a radio emmission 1 meter long between Melbourne and South Africa, and that is if the radio telescope is pointing exactly at the right spot in the universe, at the exact 1 meter interval in time between melb and sth afriuca? That we didnt miss the 1 meter transmission interval over the last 13.5 billion years?
And you ask why have we not detected ET?
:)