Norman Thagard flew four short-duration space shuttle missions before spending four months on the Russian space station Mir in 1995 (see Chapters 10 and 11).
I won't pretend to be a seer. I won't pretend to have a crystal ball. But I would hope that humans never lose that desire to explore and discover. And certainly, space is an area that we don't have wide access or easy access to. There are still a lot of things we could learn and do. We could go back to the Moon. We could go to Mars. I really hope that we do those things. And I think that we will do those things. It's hard for me to believe that humans won't do things which they are capable of doing, and certainly this business of sending humans off to Mars excites a lot of people. It is a difficult thing to do, and as Kennedy said, we do things not necessarily because they are easy, but because they are difficult. Besides, the opportunity is there to learn about the origins of the universe and the origins of humans, for instance. So I think those are things that we are going to want to do and things that we will do.