The setting of post-apocalyptic fiction, a venerable genre of science fiction, is a future in which today’s technological civilization has been destroyed by some global catastrophe — nuclear war, a plague, a meteor impact, a new Ice Age. The survivors of the disaster find themselves living in the conditions of a new medievalism, or perhaps a new Stone Age. Often to survive they must battle against zombies or mutants in the ruins of once-great cities. Now and then, in post-apocalyptic tales, the primitives of the future uncover shining relics of our forgotten industrial era — a computer, perhaps, or a spaceship.
Something similar has happened to the science fiction shelf at the bookstore in the last few decades. Stories about space travel and robots and domed cities in a gleaming high-tech future have all but disappeared, while the shelves groan under the weight of multi-novel series about medieval warriors in magical kingdoms, like George R. R. Martin’s Game of Thrones. Aliens from other planets in the solar system or other solar systems are on the endangered species list. Their place in the ecosystem of the imagination has been taken by vampires, werewolves, fallen angels, and, sometimes, repressive governments.
More… “The Lost Frontier”