Common Quote by Anonymous

I believe alien life is quite common in the universe, although intelligent life is less so. Some say it has yet to appear on…

— Stephen Hawking

Intelligent life can't be all that common because it's really rare on Earth and especially since we define ourselves to be intelligent. But in…

— Neil deGrasse Tyson

If this is the only planet on which not only life, but intelligent life, has arisen, that would be very unusual.

— Seth Shostak

[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

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

— Albert Einstein

I think there's all kinds of life out there, including intelligent life, but the reason we haven't found each other is because of vast…

— Leroy Chiao

Is there intelligent life on Earth?

— Frank Drake

It's overwhelmingly likely that life exists on other planets.

— Paul Horowitz

“To think that there are no primitive or intelligent life forms outside the world means to have never grasped the ability of this universe…

— Mehmet Murat ildan

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

A lot of work and money has been spent on astronomy and yet we have not found life. So we are rare, and rare…

— John Gummer

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