Science fiction explores worlds, technologies, and phenomena made possible by scientific discoveries or visions of the future. Space travel, artificial intelligence, genetic technologies, robots, contact with other civilizations, and changing human societies are only some of its themes.
What primarily distinguishes science fiction from fantasy is its approach to the extraordinary: the key elements of its worlds usually have a scientific or technological basis. Even the boldest ideas are considered as possible consequences of the development of science, technology, or human civilization.