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

Imagine we could accelerate continuously at 1 g-what we're comfortable with on good old terra firma-to the midpoint of our voyage, and decelerate continuously at 1 g until we arrive at our destination. It would take a day to get to Mars, a week and a half to Pluto, a year to the Oort Cloud, and a few years to the nearest stars.

We are the only species on the planet, so far as we know, to have invented a communal memory stored neither in our genes nor in our brains. The warehouse of this memory is called the library

There are wonders enough out there without our inventing any.

I believe that in every person is a kind of circuit which resonates to intellectual discovery-and the idea is to make that resonance work

I consider it an extremely dangerous doctrine, because the more likely we are to assume that the solution comes from the outside, the less likely we are to solve our problems ourselves.

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