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 are the stars? Exploration is in our nature. We began as wanderers, and we are wanderers still. We have lingered long enough on the shores of the cosmic ocean. We are ready at last to set sail for the stars.

If we long for our planet to be important, there is something we can do about it. We make our world significant by the courage of our questions and by the dept…

If you wish to make an apple pie from scratch, you must first invent the universe.

For most of human history we have searched for our place in the cosmos. Who are we? What are we? We find that we inhabit an insignificant planet of a hum-drum …

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

It is still an open question as to whether mankind or insects shall ultimately inherit the earth. It is my opinion that mankind ... has about a 50-50 chance....

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…