I think humans will reach Mars, and I would like to see it happen in my lifetime.

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.

As we reflect back upon the tragic loss of Challenger and her brave crew of heroes who were aboard that fateful day, I am reminded that they truly represented the best of us, as they climbed aloft on a plume of propellant gasses, reaching for the stars, to inspire us who were Earthbound.

We must still think of ourselves as pioneers to understand the importance of space.

It was challenging to understand what was necessary to successfully carry out all the training simulations that we, as crewmen, would experience, and make a very successful use of that training and education.

I think both the space shuttle program and the International Space Station program have not really lived up to their expectations.

The guys who walk on Mars are going to be historic.