The cosmos is within us. We are made of star stuff.

The values of science and the values of democracy are concordant, in many cases indistinguishable. Science and democracy began - in their civilized i….

Indeed the reasoned criticism of a prevailing belief is a service to the proponents of that belief; if they are incapable of defending it, they are w….

The secrets of evolution are death and time-the deaths of enormous numbers of lifeforms that were imperfectly adapted to the environment; and time fo….

What distinguishes our species is thought. The cerebral cortex is in a way a liberation. We need no longer be trapped in the genetically inherited be….

We are the first species to have taken our evolution into our own hands..

.. Think of the rivers of blood spilled by all those generals and emperors so that in glory and in triumph they could become the 'Momentary' masters ….

When you buy a used car, you kick the tires, you look at the odometer, you open up the hood. If you do not feel yourself an expert in automobile engi….

Since, in the long run, every planetary society will be endangered by impacts from space, every surviving civilization is obliged to become spacefari….

If the constellations had been named in the twentieth century, I suppose we would see bicycles and refrigerators in the sky..

What's the harm of a little mystification? It sure beats boring statistical analyses..

The price we pay for anticipation of the future is anxiety about it.

Billions and billions..

In the deepest sense the search for extraterrestrial intelligence is a search for ourselves..

Man is the matter of the cosmos, contemplating itself..

We were wanderers from the beginning..

My wonder button is being pushed all the time..

I don't know the answer. Maybe no one knows. Maybe when you grow up, you'll be the first to find out..

In exchange for freedom of inquiry, scientists are obliged to explain their work..

Virtually every major technological advance in the history of the human species - back to the invention of stone tools and the domestication of fire ….

Any civilization that doesn't develop space travel dies..