A response to the previous article: > > http://www.npr.org/sections/13.7/2016/07/14/485992587/were-there-aliens-before-us > >Here is our question: > > "What would the bio-technical probability per planet have to be for us to be the only civilization that ever occurred in the entire history of the universe?-> Comment: Huge article worth reading. Previous alien civilizations are slightly possible.-Regardless of what the thinkers think of the probabilities of life elsewhere, if there is there is or if there isn't there isn't. For me, evidence as well as logic weighs heavily on the side that there is.