In my opinion no one ever asks the right question when it come to intelligent life elsewhere.
IF intelligent life exists elsewhere (that is more advanced than us)... HOW would it hide?
Because it seems to me that if we can prove easily that life HAS to exist elsewhere... then it MUST be purposely hiding. Which leads one to ask some serious questions like... is dark matter (the 90% of the universe that is missing) ... simply alien civilizations that have found a way to hide themselves?
I read a sci-fi book where a high % of all the red dwarfs we detect are in fact much larger stars behind dyson spheres. Also if you take stars and move them between the galaxies and put them in d. spheres I’m not sure how you would detect them.
FReegards
that is an interesting question to ponder. Why are they hiding? Why not just say, hey! we’re here....