“I could have gone on for another three or four orbits, but it was a question of playing it safe.”— Gordon Cooper
“The rocket 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.”— Willy Ley
“The biggest challenge is not the engineering and the rocket science, but it's the dealing with the human factors in long-duration spaceflight.”— Leroy Chiao
“I have the best of all worlds. I'm seeing the most beautiful sights, both on the Earth and in the heavens.”— Laurel Clark
“Things were beginning to malfunction. The attitude control system was acting up, and the automatic pilot was not working.”— Gordon Cooper
“John and I were certainly aware that there was a good chance we were not going to come back. But we were willing to take that risk.”— Robert Crippen