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Hey, Catman!  The Drake equation focuses on the existence of civilizations.  It assumes that we are doing the best we can to search for them, but our best is dependent upon the current state of our technology.  At one time SETI only had one radio telescope dedicated to searching for extraterrestrial signals, and that only part time.  Now I think there’s a whole network of dishes searching.  And it’s quite possible that the aliens are using subspace communications that we can’t even detect.  If that’s the case we’ll never run into them except by accident.  I don’t see how the equation can take that into account.