Science fiction.

Science fiction is a literary genre characterized by its inclusion of real or imaginary science and technology and its impact on people and societies. Science fiction plots usually take place in a futuristic or alternate world. Many narratives are set in space or in fictional universes. Characters can be human, extraterrestrial, or other imagined beings. Science fiction contains a number of subgenres such as cyberpunk, time travel, space opera, and apocalyptic. Science fiction writings date back to ancient Greece, but the roots of modern science fiction lie in the early nineteenth century with writers such as Mary Shelley and Jules Verne.