Perhaps the best motivation for going to Mars is political. It is obvious that no single nation currently has either the will or the resources to do it alone, but a consortium of nations and space agencies could achieve it within 20 years.

I've seen Bruno Mars before, he's amazing.

Of all the planets apart from Earth in our solar system, Mars is the most hospitable. Yeah. Right. Better keep my visit short. And yet, despite the discomfort, the danger, I love it here. I love coming back for these imaginary vacations. The sights are amazing.

A visitor from Mars could easily pick out the civilized nations. They have the best implements of war.

Sex keeps me in shape. I don't diet, I eat what I like. I love Mars bars and I smoke and drink. But I love running off in the middle of the day to make love. It really burns up calories.

I love life in spite of all that mars it. I love friendship, jokes and laughter.

For me my friendship with Omar Rodriguez from Mars Volta that friendship really means a lot to me because he's another creative person who works as hard as I do.

Clearly, some creative thinking is badly needed if humans are to have a future beyond Earth. Returning to the Moon may be worthy and attainable, but it fails to capture the public's imagination. What does get people excited is the prospect of a mission to Mars.

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It's not going to do any good to land on Mars if we're stupid.

Fifty percent of our country that we own, have all legal jurisdiction, have all rights to do whatever we want, lies beneath the sea and we have better maps of Mars than that 50 percent.

When you talk about obesity, there's so many things that can cause that. It can be a medical thing, or down to the individual. There's a lot of other things involved than eating a Mars bar.

From my music training, I knew that, some Spanish rhythms apart, 5/4 is a time signature used only in the modern era. Holst's Mars from the Planets is 5/4. But if you speak lines of poetry in that pattern you just end up hitting the off-beats. It's only when you add a rest - a sixth beat - that it sounds as it surely should sound.

I don't really see science fiction as fiction. I can imagine colonies on Mars and everything.

When we see the shadow on our images, are we seeing the time 11 minutes ago on Mars? Or are we seeing the time on Mars as observed from Earth now? It's like time travel problems in science fiction. When is now when was then?

A permanent base on Mars would have a number of advantages beyond being a bonanza for planetary science and geology. If, as some evidence suggests, exotic micro-organisms have arisen independently of terrestrial life, studying them could revolutionise biology, medicine and biotechnology.

One hardly knows where, in the history of science, to look for an important movement that had its effective start in so pure and simple an accident as that which led to the building of the great Washington telescope, and went on to the discovery of the satellites of Mars.

We are involved in technology development for, you know, missions that we hope to plan that would take us to an asteroid and eventually to Mars.