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

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

We can lick gravity, but sometimes the paperwork is overwhelming.

Our sun is one of 100 billion stars in our galaxy. Our galaxy is one of billions of galaxies populating the universe. It would be the height of presumption to think that we are the only living things in that enormous immensity.

Research is what I'm doing when I don't know what I'm doing.

Man is the best computer we can put aboard a spacecraft, and the only one that can be mass produced with unskilled labor