The odds will vary greatly depending on whether we mean any life (microbial or unicellular life seems most likely), or complex, let alone sentient life. Techni

The odds will vary greatly depending on whether we mean any life (microbial or unicellular life seems most likely), or complex, let alone sentient life. Technically the term encompasses the former too, but all too often people seem to equate it with the latter. Personally I am more convinced by the "rare Earth" hypothesis too, and I don't believe humanity will discover complex alien life ever thorough its existence. Obviously I understand why this point of view gets the boos.