What's a space walk really like?

Say what you will about the science. The movie "Gravity" makes you feel like you're in space.

Of course, only a few people know that feeling firsthand. NASA astronaut Michael Massimino is one of them.

Massimino flew on two Hubble Space Telescope servicing missions. And he has logged more than 30 hours across four space walks.

That's exactly what the movie's main characters are doing when everything goes wrong.

So, what's it really like to spacewalk?

"You have to be methodical about what you do. You don't want to move too quickly," Massimino says. "You have to be very, very slow. You have to think about what you're doing. Work with your teammates, both outside the spaceship, inside the spaceship and the people on the ground."

Massimino admits it can be scary. But he adds, "I can't think of anything better to do for a living than go out and spacewalk and work out there in the beauty of space."

Find out what Massimino thinks of the movie, and George Clooney in particular, in the full interview above.