So the movie is missing a few critical scenes, but it's still pretty true to the book (and full of science).

Leroy Chiao, former NASA astronaut and commander of the International Space Station, pointed out a more specific example in an op-ed for Space.com: The movie ... props to "The Martian" for its ...

"The Martian" has been hailed as one of the best science based sci-fi movies in recent years. However, even with all that factual science behind the film, there were some things the film just got ...