The hand prints and initials of Actor Matt Damon, who stars as NASA Astronaut Mark Watney in the film “The Martian,” are seen in fresh cement at the Jet Propulsion Laboratory (JPL) Mars Yard, Tuesday, Aug. 18, 2015, at the JPL in Pasadena, California. While at JPL Damon meet with NASA scientists and engineers who served as technical consultants on the film. The movie portrays a realistic view of the climate and topography of Mars, based on NASA data, and some of the challenges NASA faces as we prepare for human exploration of the Red Planet in the 2030s.