Posted: Aug 4, 2007, 6:54 PM CST
Funguy, please don't consider this a personal attack.
You suffer from the same blindness most empiricists suffer from. "I haven't tested it, so it must not be real." The Drake equation makes many suppositions. It is all based on estimates of things we cannot measure and cannot know. The actual number of stars, the actual number of planets, the actual length of time any given civilization is in existence. There is a statement somewhere in one of the responses or links, "Even if they existed, it would be too expensive to travel here." It should be pointed out that that is by our standards only. Less than 150 years ago, they would have said, "Even if there was life on the moon they couldn't get here. What would they do, throw water in front of the boat so they could sail this far?" The assumption is only a minimally advanced level of development beyond ours with such statements. We might miss intelligent life that is pre-radio. (Given the narrowness of our current search, we may miss many planets right now that actually do have radio.)
Some of us are hopeful that a truly advanced civilisation beyond ours would still be listening, even if they stopped broadcasting into the ether so many years ago that their signals passed by while the dinosaurs ruled. Some of our hopeful that their energy techonology has advanced beyond basic petrochemical reaction engines to something we haven't dreamed of, and that it won't bankrupt their system to travel space. Some of us hope that a sufficiently advanced system would have advanced beyond Einstiein's unfinished Unified Field Theory, completing it and searching for the next step. Was it Heinlein that said any sufficiently advanced technology appears as magic? Maybe we have seen magic. I'm not going to disallow it because I can't measure it yet.