Like actors and writers who are on and off again in terms of employment, I had a very unstructured life.

The best way to study Mars is with two hands, eyes and ears of a geologist, first at a moon orbiting Mars... and then on the surface.

I'm not in favor of just taking short-term isolated situations and depleting our resources to keep our climate just the way it is today.

I want to keep on the move, keep stimulated and challenged.

In space, you don't get that much noise. Noise doesn't propagate in a vacuum.

The first human beings to land on Mars should not come back to Earth. They should be the beginning of a build-up of a colony/settlement, I call it a 'permanence'.

It's not easy to get human beings into orbit. So far only three nations have been able to do that, with all the resources that they put together. And I'm just a little skeptical that that's going to be done by the private sector without making use of what has been done by the government.