Much like Leonardo DiCaprio, few would have guessed that young pretty boy Brad Pitt would have developed into the mature and immensely versatile actor that he is today. And after watching 'Fury' we have to say it looks like he's only getting better!
Webster's English Dictionary defines hard science fiction as being 'characterized by an emphasis on scientific accuracy or technical detail or both' (just kidding it's Wikipedia). So, basically sci-fi that would satisfy 'Comic Book Guy' from The Simpsons.
Movies in the vein of Interstellar: These cerebral sci-fi masterpieces are guaranteed to get you thinking about time, space, destiny, free-will, and pretty much every other insoluble existential mystery. The thinking man's blockbusters!
Movies in the vein of 'Gravity': tense space-based thrillers in which one of the manifold things that can go wrong on a space mission inevitably does, leaving the crew stranded and understandably a bit miffed at Houston.