Hari Sreenivasan:

It's a dream many have had, traveling into space, and then even living there for some period of time.

Just a small group of people on the planet have done it. That includes American astronaut Scott Kelly.

Naturally, our Miles O'Brien had lots of questions about what happens to the human body, and to the person, once back on Earth.

It's part of our weekly series about the Leading Edge of science.