Alternate Worlds was first published in 1975 and became an instant classic, winning a Hugo Award the next year. This edition brings the history of science fiction up to date with a chapter covering developments over the past forty years, a period that has seen the advent of technologies only imagined in the genre's Golden Age. As a literature of change, science fiction has become increasingly meaningful, presaging dangers to humanity and, as Alvin Toffler wrote, guarding against 'the premature arrival of the future.' The world has begun to recognize science fiction in myriad ways, incorporating its visions in products, visual media and huge conventions. James Gunn describes its arc from early myth and fancy to today's complex literature, as the world itself was changed by exploration, science and technology.