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Every couple of years, we could dispatch people from Earth to Mars.

We constantly learn new lessons up here. The experiences we gather will enable us to establish a long-term station on the moon and to go on to Mars.

It's great that people are interested in Mars.

To deliver vast new resources to humanity, we must pioneer and occupy the moon, Mars, and perhaps even beyond.

We want to make sure we get living astronauts to the surface of Mars.

I'm convinced that sending people to Mars is so expensive that if you go once and bring the people back and then go again and bring the people back, we're eventually going to run out of money. But what if we send people the first time and they don't come back? What if they stay there?

I want to get to the moon. I want to go to Mars.

What kind of world is this that can send machines to Mars and does nothing to stop the killing of a human being?

Space architectures capable of supporting a permanent human presence on Mars are extraordinarily complex, with many different interdependent systems.

Back in the days of Apollo, sending humans to the moon was the only viable way to get the scientific data we wanted. But now, with our computer and robotics technology, there's very little an astronaut can do on Mars that a well-designed rover can't.