5 Hard Sci-Fi Movies That Failed the Genre

There is a special kind of betrayal in a sci-fi movie that makes you start thinking seriously about orbital mechanics and then rewards that effort with magic rocks. Bad science fiction can be glorious when everybody knows the assignment. Hard sci-fi makes a different promise. It brings oxygen reserves, launch windows, terraforming, radiation, propulsion, pressure, and engineering into the conversation, which naturally makes some of us annoying enough to notice when the whole thing starts cheating.