One has only to go out in the country, where there's little light pollution, and look at the night sky and then you realize how large the universe is. Then the foolishness of the idea that we're the only ones around becomes clear. Not only are there others out there, but we are Johnny Come Latelies and probably by large amounts of time. Mars likely had life billions of years ago when it had water. Mars is ancient, we are newborns.

Also, existence of things like the Black Knight satellite show there obviously have been others around.

One has only to go out in the country, where there's little light pollution, and look at the night sky and then you realize how large the universe is. Then the foolishness of the idea that we're the only ones around becomes clear. Not only are there others out there, but we are Johnny Come Latelies and probably by large amounts of time. Mars likely had life billions of years ago when it had water. Mars is ancient, we are newborns.