'The Martian': Jessica Chastain Gets In Touch With Exploration's Human Side | Video

To prepare for the film the actress worked with NASA to learn about the realistic aspects of space exploration. Chastain and NASA astronaut Tracy Caldwell Dyson explain.

The movie is based on the book by Andy Weir. (Read the first chapter of the 'The Martian' on Space.com)

credit : NASA/20th Century Fox