It takes sixty-five thousand errors before you are qualified to make a rocket.

The rocket worked perfectly, except for landing on the wrong planet.

If we were to start today on an organized and well-supported space program I believe a practical passenger rocket can be built and tested within ten years.

Don't tell me that man doesn't belong out there. Man belongs wherever he wants to go - and he'll do plenty well when he gets there.

Man belongs wherever he wants to go - and he'll do plenty well when he gets there.

I have learned to use the word 'impossible' with the greatest caution.

Man is not made for space. But with the help of biologists and medical doctors, he can be prepared and accommodated.