<P> As a result, science fiction film came into its own in the 1950s, producing films like Destination Moon, Them!, Invasion of the Body Snatchers, Forbidden Planet, and many others . Many of these movies were based on stories by Campbell's writers . The Thing from Another World was adapted from a Campbell story, Them and Invasion of the Body Snatchers were based on Jack Finney novels, Destination Moon on a Heinlein novel, and The Beast from 20,000 Fathoms was derived from a Ray Bradbury short story . John Wyndham's cosy catastrophes, including The Day of the Triffids and The Kraken Wakes, provided important source material as well . </P> <P> At the same time, science fiction began to appear on a new medium--television . In 1953 The Quatermass Experiment was shown on British television, the first significant science fiction show, though it could also be described as horror . In the United States, science fiction heroes like Captain Video, Flash Gordon and Buck Rogers were shown, programs that more closely resembled pre-Campbellian science fiction . </P> <P> Seeking greater freedom of expression, writers started to publish their articles in other magazines, including The Magazine of Fantasy and Science Fiction, If magazine, a resurrected Amazing Stories, and most notably, Galaxy . </P> <P> Under editors H.L. Gold and then Frederik Pohl, Galaxy stressed a more literary form of science fiction that took cues from more mainstream literature . It was less insistent on scientific plausibility than Campbell's Astounding . The rise of Galaxy signaled the end of Golden Age science fiction, though most of the Golden Age writers were able to adapt to the changes in the genre and keep writing . Some, however, moved to other fields . Isaac Asimov and several others began to write scientific fact almost exclusively . </P>

When was the first science fiction book written