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I think it's inevitable that there will be Earthlings establishing a presence on Mars. And I would say that it would certainly take place by 2050 or shortly thereafter.

We're not going to get humans to Mars until at least the mid-2030s, and the world is going to change by then.

If humanity doesn't land on Mars in my lifetime, I would be very disappointed.

People will visit Mars, they will settle mars, and we should because it's cool.

I think that when humans get around to exploring and building cities and towns on Mars, it will be viewed as one of the great times of humanity, a time when people set foot on another world and had the freedom to make their own world.

I would suspect strongly that over a period of time, if we put our mind to going to Mars, it will be a consortium of several countries.

Can you imagine, in 2030, taking a space cruise on the very ship that carried the first human beings to Mars? I can't believe that people wouldn't line up for that possibility.

As we visit Mars multiple times, we will build up infrastructure on the surface to expand the capabilities and reach of humans on Mars.

Some day we'll move into space and start ensuring the survival of our species beyond Earth, whether it happens in a hundred years or a thousand.

If there was an observer on Mars, they would probably be amazed that we have survived this long.