Assuming Quote by Paul Davies

The chances of human beings being the only intelligent form of life in the universe are so minuscule that it's really kind of crazy…

— Zoltan Istvan

If we find life out there, and it's not us, we will deem it not intelligent. But what may be equally as likely is…

— Neil deGrasse Tyson

I hope that someday we will find evidence that there is intelligent life among humans on this planet.

— Sylvia Earle

Even if there is intelligent life somewhere, which perhaps there is, I'm agnostic about it, I don't know.

— Luka Jones

The question is not whether there is intelligent life out there, the question is, whether there is intelligent life down here. As long as…

— Jacque Fresco

I believe that there may be intelligent life on other planets.

— Pat Buckley

I don't see why there is no intelligent alien life in the universe.

— Neil deGrasse Tyson

[My study of the universe] leaves little doubt that life has occurred on other planets. I doubt if the human race is the most…

— Harold Urey

Once we see, however, that the probability of life originating at random is so utterly minuscule as to make it absurd, it becomes sensible…

— Fred Hoyle

The issue, as correctly emphasized by Carl Sagan, is the probability of the evolution of high intelligence and an electronic civilization on an inhabited…

— Ernst Mayr

I think more and more scientists are becoming convinced that it's very likely that life forms of some kind exist all around the universe…

— Ron Howard

Is there intelligent life on Earth?

— Frank Drake