Interesting article! Thanks for sharing!
Well I always fall back to Drakes equation...
https://en.m.wikipedia.org/wiki/Drake_equation
I love to play with the numbers for the variables of that equation.
One thing though, simply the harsh fact of our known physics and here especially, the ultimate speed limit for information and matter, makes me somewhat skeptic if we in our lifetimes will see proof of alien life.
Cheers!
RE: We are not alone. The Universe is teeming with life, much of it far more intelligent and advanced than mankind