THE MARTIAN

"The Martian" is about American astronaut, Mark Watney, who is accidentally left for dead on the Martian surface. He has limited supplies and resources and no way to contact Earth. The astronaut could survive under these conditions and get himself rescued.
    The movie involves astronauts on the NASA spacecraft Hermes attempting something called a gravity assist, which is a trip around a planet in the direction in which it is rotating to get energy boost. This is a both a real maneuver in space travel and that it is accurately represented in "The Martian". In the film, the Hermes crew is on the way back to Earth when they realize that returning to Earth and then launching for Mars to get supplies to watery will take too long. Instead, they arrange to travel around Earth using the planet's gravitational field to propel the Hermes back toward Mars. This helps the crew save both time and fuel.