My FB comment
You see, it’s okay to speculate – wildly – about aliens on other worlds because those worlds are so far away that there’s no way we’re going to find out one way or the other. I could just as well say that there are no alien civilizations because there’s no way to prove that I’m wrong.
I still happen to believe there are so many goldilocks planets among the billions of stars in all the galaxies out there that it’s likely there are others like us. But it will always be a belief until humans can time travel. And that ain’t happening!