One of the most interesting articles I've ever read on this subject is this: http://en.wikipedia.org/wiki/Fermi_Paradox http://en.wikipedia.org/wiki/Fermi_Parad

One of the most interesting articles I've ever read on this subject is this: http://en.wikipedia.org/wiki/Fermi_Paradox http://en.wikipedia.org/wiki/Fermi_Paradox Just in case you haven't heard of it, FTA: "The Fermi paradox is the apparent contradiction between high estimates of the probability of the existence of extraterrestrial civilizations and the lack of evidence for, or contact with, such civilizations." If you get the chance, check it out. Some of the ideas in there are incredible!