Jim Green, director of Planetary Science at NASA Headquarters in Washington, attends the world premiere for "The Martian” on day two of the Toronto International Film Festival at the Roy Thomson Hall, Friday, Sept. 11, 2015 in Toronto. NASA scientists and engineers 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.