@Helio told me about this thread on discord so i had to add my comments...
@Spartacus almost finished the heuristic proof of aliens he just had to add in the assumption of .0000001% or some small percent chance for life on a given planet you'd end up with
10^12 * 10^11 *.8 * 2 * 10^-9 = 1.6x10^14 planets with life on them in the universe.
Lets also remember that the universe is only like 13.8 billion years old so maybe that number is taking into account future and past dead planets, which even still that implies there should still currently be something somewhere in the cosmos that is not human.
That all being said see the other thread about the size of the universe. There's no chance we have or will ever meet those creatures. We, the human race, are all in a small planet sized jail that we cannot leave except to go to our one natural satellite and then return home shortly after.