Astronauts are very professional and when they're preparing for launch, they prepare for it as the most serious endeavor of our lives.

Being an astronaut is a wonderful career. I feel very privileged. But what I really hope for young people is that they find a career they're passionate about, something that's challenging and worthwhile.

I think of it as a good opportunity to let, in particular, school kids know that this job and other interesting jobs in science and engineering are open to anyone who works hard in school and gets a good education and studies math and science. And that it's not just for a select group of people.

The ISS operates as the 'anchor customer' in low earth orbit to support new commercial space services, including delivery of cargo and, before long, crew transportation services.

I vowed to myself that when I grew up and became a theoretical physicist, in addition to doing research, I would write books that I would have liked to have read as a child. So whenever I write, I imagine myself, as a youth, reading my books, being thrilled by the incredible advances being made in physics and science.

Fruitful discourse in science or theology requires us to believe that within the contexts of normal discourse there are some true statements.

But the scientific importance of a change in knowledge of fact consists precisely in j its having consequences for a system of theory.

When I accepted the commission, I had something of an epiphany in the research I did about the agency, actually the science of espionage. I realized there is a connection between the sciences and the invisible forces of man.