GT, you do realize science also uses proxies and extrapolations, right?Science tests assumptions, they don't state them as fact like you do, #dingerredScience does that all the time.Assumes facts not in evidence, like all you feeble minded fuckeryOnly an idiot would argue that life isn't rare in the universe, especially intelligent life which is the pinnacle of creation.
You see a lot of life teeming in our solar system. Extrapolate that.