I don't think we should have to do a Mars mission on the basis of hysteria. I think we should do a Mars mission on the basis of a deliberate judgment that what we want to do is open up a new planet for humanity... that we are continuing to be a nation of pioneers.

We have never been in danger of running out of resources, but we have encountered considerable dangers from people who say we are running out of resources and who say that human activities need to be constrained.

The space program needs a goal, and the goal should be humans to Mars.

Robert Zubrin Quotes