To confine our attention to terrestrial matters would be to limit the human spirit.

There are grounds for cautious optimism that we may now be near the end of the search for the ultimate laws of nature.

We could call order by the name of God, but it would be an impersonal God. There's not much personal about the laws of physics.

The world has changed far more in the past 100 years than in any other century in history. The reason is not political or economic but technological - technolo…

We embarked on our cosmic voyage with a question first framed in the childhood of our species and in each generation asked anew with undiminished wonder: What …

I don't think the human race will survive the next thousand years, unless we spread into space. There are too many accidents that can befall life on a single p…

It will free man from his remaining chains, the chains of gravity which still tie him to this planet. It will open to him the gates of heaven.