@CorruptUser I don't think anyone's suggested Venus is "teeming with life". As for the Great Pumpkin, er, Filter, I think it's far more likely that we just aren't anywhere near as smart or perceptive as we'd like to think we are, and there is so much more out there in the universe thane we have yet been able to discern. Both time and space are vast, and the average number of advanced civilizations existing simultaneously in a given volume of space may be quite low. As Nihil has already pointed out, there is good reason to think we wouldn't pick up a lot of what is out there anyway.
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@CorruptUser I don't think anyone's suggested Venus is "teeming with life". As for the Great Pumpkin, er, Filter, I think it's far more likely that we just aren't anywhere near as smart or perceptive as we'd like to think we are, and there is so much more out there in the universe thane we have yet been able to discern. Both time and space are vast, and the average number of advanced civilizations existing simultaneously in a given volume of space may be quite low. As Nihil has already pointed out, there is good reason to think we wouldn't pick up a lot of what is out there anyway.