Is it that many? Damn it, I just read somewhere the other day that there were only a few that close. I gotta stop getting my scientific data from the Taliban Instutute of Technology.
Though, in a way, you could probably conjecture that there aren't any 2001-esque levels of huminoid intelligent life there, because we would have picked up their stuff too, eh?
Of that I have no idea :)
My search continues!