Science fiction is a genre of writing that works on the assumption that there are alternative galaxies and realities in the world. The impact of science and technology are taken into account to create an alternate world full of advancements in the areas of computers, human evolution, or machinery. The borders of science fiction are not always clear, but in general, sci-fi is a genre in which an imagined world can be created and legitimized through science and technology. A popular theme among sci-fi novels and films is extraterrestrial occupation or visitation on Earth. Books and movies like The War of the Worlds and E.T. address our rampant fascination with the notion that aliens can, have, or do live among us. Parallel or alternate dimensions are also a key ingredient in many science fiction stories. Some of the most popular science fiction authors of the past and present include Isaac Asimov, Ray Bradbury, Michael Crichton, and Carl Sagan. For those who enjoy sci-fi suspense, vintage authors such as George Orwell and Aldous Huxley are worth checking out. On the other hand, for those looking for more action, modern master Michael Crichton has built a huge fan base with his adventurous and imaginative take on the sci-fi genre. Also, the genres of science fiction and fantasy coincide quite a bit. Fans of both categories might be interested in bestselling authors such as Marion Zimmer Bradley, C.J. Cherryh, Anne Rice, and Stephen King. Fortunately for readers, this is very popular field and new titles are in release constantly, allowing fresh and exciting writers to come to the fore.
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