Almost everything about the universe is astounding.

If you want to have a program for moving out into the universe, you have to think in centuries not in decades.

The thing that makes me most optimistic is China and India - both of them doing well.

I belonged to a small minority of boys who were lacking in physical strength and athletic prowess. ... We found our refuge in science. ... We learned that science is a revenge of victims against oppressors, that science is a territory of freedom and friendship in the midst of tyranny and hatred.

You could say science also is an art.

The purpose of thinking about the future is not to predict it but to raise people's hopes.

There is no way to find the best design except to try out as many designs as possible and discard the failures.