Aliens Quote by Neil deGrasse Tyson

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

— Sylvia Earle

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

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

For all we know, the aliens have already done this and unwittingly concluded that there was no intelligent life on Earth. They would now…

— Neil deGrasse Tyson

Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us.

— Bill Watterson

Perhaps we've never been visited by aliens because they have looked upon Earth and decided there's no sign of intelligent life.

— Neil deGrasse Tyson

The surest sign that intelligent life exists somewhere else in the universe is that it has never tried to contact us.

— Young Siddiq Prince

[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 surest sign that intelligent life exists elsewhere in the universe is that it has never tried to contact us.

— Bill Watterson

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

— Neil deGrasse Tyson

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