Extinct Quote by John F. Kennedy

Why do we worry about intelligent life on other planets if we doubt it here on earth?

— Frederick A Babb

Personally, I don't think there's intelligent life on other planets. Why should other planets be any different from this one?

— Bob Monkhouse

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

— Paul Horowitz

I don't think we are the only planet that has life.

— Sandra Bullock

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

— Pat Buckley

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

— Albert Einstein

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

— Franklin D. Roosevelt

[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

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

— Seth Shostak

This planet seems to be in such sorry shape. And I can't ever think about the rest of the universe without coming back home…

— Ann Druyan

I agree, along with Carl Sagan, that we should eventually become a two planet species. Life is too precious to place on a single…

— Michio Kaku

The discovery and investigation of life on other planets is likely to change many of our ideas about how life arose on the Earth…

— George Smoot