I feel we need to remind the world about the Apollo missions and that we can still do impossible things.

My first inclination is to be a bit skeptical about the claims that human-produced carbon dioxide is the direct contributor to global warming.

Not everyone will understand this need for America to lead the world in space.

Exploration is wired into our brains. If we can see the horizon, we want to know what's beyond.

You need propellants to accelerate toward Mars, then to decelerate at Mars, again to re-accelerate from Mars to Earth, and finally to decelerate back at Earth. Accordingly, the mass of these required propellants, in short, drives our need for innovative launch vehicles.

We could have human intelligence in orbit around Mars, building things there.

I feel we need to remind the world about the Apollo missions and that we can still do impossible things.