Human beings are fascinated with the search for life on other planets (that and the search for love). Perhaps not least because the discovery of extraterrestrial life (and especially intelligent life) would have fascinating theological implications. Personally I see no reason to think that the third planet out from an inconsequential star in a middling suburb of the Milky Way galaxy would attract the kind of interest that makes UFOlogists believe Earth is the Grand Central Station of the universe. But I also find it hard to believe that, in the vastness of all that exists, there is no other life. It's a big universe: someone's got to populate it.