[Space] is the next frontier, and you have to know how to work in that environment before you ever want to go any farther. We went to the moon, and then we haven't gone anywhere else.

But we really haven't developed sufficiently the technologies that we want to use to get there, and we haven't learned enough about ourselves as far as what happens to the human body when it's on-orbit. We need this station to be able to do that, to work on those technologies, to come up with better ways to counteract the effect of weightlessness on the human body.