Watch this.
He is a big brained professor who uses statistics to estimate the likelihood of us being alone, he’s way smarter than NDT and Bill Nye and admits we have no way of knowing.
But he makes a solid case using the Drake equation that we could be the only intelligent species currently broadcasting in the Milky Way.
If out of each development of life on a habitable planet, 5% of those go on to spawn intelligence, we are probably alone in the galaxy for now. But this video is about the fact that our best chance for contact is 4 dimensional. Basically we intercept communications from a long dead civilization, then we eventually launch our knowledge into space and by the time the next civilization develops, we’re long gone, and it continues.
this guy is really the best Astronomy channel I have ever encountered. He has a ton of published papers so he is as credible as anyone can get on the subject.
https://youtu.be/aB6kQwZZm5k 
