Conservation Quote by Sylvia Earle

I wonder if, in fact, we have been observed by aliens and upon close examination of human conduct and human behavior they have concluded…

— Neil deGrasse Tyson

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

— Pat Buckley

Is there intelligent life on Earth?

— Frank Drake

Only when science and technology are used with human concern in a world in which all of the earth's resources are held as the…

— Jacque Fresco

Intelligent life on other planets? I'm not even sure there is on earth!

— Albert Einstein

There's already a world of evidence that life on Earth is unique and intelligently crafted.

— Eric Metaxas

[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

The best proof that there's intelligent life in the universe is that it hasn't come here.

— Arthur C. Clarke

Perhaps, as some wit remarked, the best proof that there is Intelligent Life in Outer Space is the fact it hasn't come here. Well,…

— Arthur C. Clarke

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

— Neil deGrasse Tyson

Coming to grips with the reality that our planet is not the only one harboring intelligent life the universe.

— Franklin D. Roosevelt