With its strong showing at the box office, The Martian joins Gravity and Interstellar in the club of science-fiction movies that succeed by emphasizing the science and downplaying the anything-goes fantasy elements. But even in this rarefied company, The Martian stands apart. Unlike Interstellar, it is rooted in present-day technology and challenges. And unlike Gravity, it fully respects the physical rules of space travel; in fact, it makes them central to the plot.
The Martian comes at a