Everyone who's been in space would, I'm sure, welcome the opportunity for a return to the exhilarating experiences there.

The first footfalls on Mars will mark a historic milestone, an enterprise that requires human tenacity matched with technology to anchor ourselves on another world.

The big companies are the private industry. But they're faced with a short-term need to show a profit in short-term.

I think there would be no shortage of applicants to the government astronaut corps to be settlers on the planet Mars. And I think this would be very inspiring.

Russia perhaps is still entertaining the possibility that the moons of Mars might have access to ice or water.

Neil Armstrong was the first man to walk on the moon. I am the first man to piss his pants on the moon.

I suggest that going to Mars means permanence on the planet - a mission by which we are building up a confidence level to become a two-planet species.