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I haven't a clue if there is life on other planets but I'd be charmed if we found a unicellular organism on Mars. It would change our whole concept of life on Earth.

Mars is the only place in the solar system where it's possible for life to become multi-planetarian.

I am confident that life once thrived on Mars and may well still exist there today.

When we get there, if we don't find any life on Mars, from that point on there will be life on Mars because we'll bring it there, whether it's germs and leftover urine bags, whatever it is.

I would enjoy flying to Mars. This was the dream of the first cosmonauts. I wish I could realize it! I am ready to fly without coming back.

I would like to die on Mars. Just not on impact.

I am absolutely certain that life can exist in outer space, move around, find a new aqueous environment.

We've gotta become the Martians. I'm a Martian - I tell you to become Martians. And we've gotta go to Mars and civilize Mars and build a whole civilization on Mars and then move out, 300 years from now into the universe. And when we do that, we have a chance of living forever.

If I hadn't been inside of Biosphere 2 and really lived a biological life-support system, I definitely would not be involved in life-support systems for space.

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