This is a subject I have discussed before. Some estimates put the number of planets in the visible universe as capable of having intelligent life as as high as 1400000000000000. Others say intelligent life is incredibly rare.
As far as I know, we have been looking with SETI since the mid 1960s and have, so far, found zero evidence. Maybe we are looking in the wrong way? As time goes by, we have more sophisticated ways of looking with ever greater sensitivity. Mind you we only discovered electro-magnetic radiation a few hundred years ago. Maybe many societies have discovered something better?
One thing is certain: should we find any signs of intelligent life "out there", it could have profound effects on human life.
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