If you are only skeptical, then no new ideas make it through to you..

It is all a matter of time scale. An event that would be unthinkable in a hundred years may be inevitable in a hundred million..

The suppression of uncomfortable ideas may be common in religion or in politics, but it is not the path to knowledge; it has no in the endeavor of sc….

Otherwise we don't run the government the government runs us.

We on Earth have just awakened to the great oceans of space and time from which we have emerged..

Those afraid of the universe as it really is, those who pretend to nonexistent knowledge and envision a Cosmos centered on human beings will prefer t….

If there is life, then I believe we should do nothing to disturb that life. Mars then, belongs to the Martians, even if they are microbes..

The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visi….

For all I know we may be visited by a different extraterrestrial civilization every second Tuesday, but there's no support for this appealing idea. T….

The size and age of the Cosmos are beyond ordinary human understanding. Lost somewhere between immensity and eternity is our tiny planetary home..

Centuries hence, when current social and political problems may seem as remote as the problems of the Thirty Years' War are to us, our age may be rem….

We are the children equally of the Sky and the Earth..

And you are made of a hundred trillion cells. We are, each of us, a multitude..

In our time, we have sifted the sands of Mars, we have established a presence there, we have fulfilled a century of dreams!.

The chief deficiency I see in the skeptical movement is its polarization: Us vs. Them - the sense that we have a monopoly on the truth; that those ot….

[N]o scientist likes to be criticized. ... But you don't reply to critics: "Wait a minute, wait a minute; this is a really good idea. I'm very fond o….

On the day that we do discover that we are not alone, our society may begin to evolve and transform in some incredible and wondrous new ways..

I believe our future depends powerfully on how well we understand this cosmos in which we float, like a mote of dust in the morning sky..

The Platonists and their Christian successors held the peculiar notion that the Earth was tainted and somehow nasty, while the heavens were perfect a….

I would be very ashamed of my civilization if we did not try to find out if there is life in outer space..

After I give lectures-on almost any subject-I am often asked, "Do you believe in UFOs?" I'm always struck by how the question is phrased, the suggest….