According to science fiction writer Robert A. Heinlein, "a handy short definition of almost all science fiction might read: realistic speculation about possible future events, based solidly on adequate knowledge of the real world, past and present, and on a thorough understanding of the nature and significance of the scientific method." Rod Serling's definition is "fantasy is the impossible made probable. Science Fiction is the improbable made possible." Lester Del Rey wrote, "Even the devoted aficionado– or fan- has a hard time trying to explain what science fiction is", and that the reason for there not being a "full satisfactory definition" is that "there are no easily delineated limits to science fiction." Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.
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| Last.fm | Sci-Fi | Derived from data | — | |
| Wikipedia | Sci-Fi | Derived from data | ↗ |
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