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Are there terms that describe a science fiction story that strictly adheres to, I guess, plausible science concepts and technology versus science fiction were the science is really just made up and is theoretically impossible? I know a lot of sci-fi TV shows, like Battlestar Galactica, employed physicists and other scientists as consultants to make sure things were accurate, whereas other shows that I won't name employed people solely to fill in technical- and sciency-sounding words in the script.

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    For reference, related question: scifi.stackexchange.com/questions/675/… – Mark Rogers Jan 21 '11 at 19:23
  • You may have heard of the Mohs scale of hardness for minerals. The TV Tropes site (WARNING! Can be addictive and time wasting!) has a page called The Mohs Scale of Science Fiction Hardness, giving numbers from 1 to 6 going from the least scientific SF up to real life. tvtropes.org/pmwiki/pmwiki.php/Main/… – M. A. Golding Apr 7 '18 at 17:43
  • Duplicate comment. The Mohs scale of hardness for minerals has inspired the addictive TV Tropes website to have a page called the Mohs Scale of Science Fiction Hardness number various works from 1 to 6 according to the hardness of their science. tvtropes.org/pmwiki/pmwiki.php/Main/… – M. A. Golding Apr 7 '18 at 17:48
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The usual term is "hard science."

If that's not what you're looking for, can you narrow down what you mean by "plausible science concepts and technology"? For instance, FTL drives aren't based on any known scientific concepts, so are you ruling out all SF with FTL travel?

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    It's my understanding that current theory puts faster than light travel as an impossibility, so ... I guess, yeah. Or, again with Battlestar -- they incorporated FTL travel and the theory of relativity (Time slowed for the Final 5 as they traveled to warn the 12 colonies). So, that would be an example that's ok. – Slick23 Jan 21 '11 at 2:23
  • FTL is not often 'hard sci-fi' in my opinion, unless the author does a really good job of explaining it. – Mark Rogers Jan 21 '11 at 18:59
  • I think you mean hard science fiction. :) – Lexible Sep 9 '18 at 4:08
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"Hard SF" is a sub-genre that basically try to keep within the accepted parameters of known science.

But it can still be pretty out there. Consider Alisdair Reynold's Revelation Space universe. FTL travel is impossible, but far-out stuff like nanotech, life extension and AI is not.

  • I suppose the difference is that FTL is definitely contrary to the laws of physics as we know them, while nanotech, life extension, and AI are compatible with such laws. – David Thornley Jan 22 '11 at 15:29
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    FTL hasn't been definitely ruled out. Hard SF authors typically get around the limitation by proposing that the space dimensions of our spacetime are rolled up in some higher dimensional macroverse and we can use the higher dimensions to take short cuts. SF readers know this scenario well, we call it hyperspace. Or the author might suppose that exotic matter has been found with negative energy density, which would permit wormholes to be held open. See Robert Forward's Timemaster for an exploration of that. The good authors don't ignore special relativity, they look for loopholes. – Kyle Jones Jan 21 '12 at 3:58
  • Hal Clement is considered the quintessential hard SF writer. Yet there is FTL travel in many of his novels. Hard SF usually has scientific sensibility, but that doesn't preclude a few way-out concepts like time travel, teleportation, & other exotic phenomena. There isn't a simple cut-off. – a4android Nov 7 at 8:18
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Another sub-genre is called Techno-thriller. Stories in this genre include many (relative to other genres) technical details. The specific abilities of technology often drive the plot. There is a big emphasis on real-world or plausible near-future technology. This genre often overlaps hard sci-fi, military fiction, and spy fiction.

Notable authors include Michael Crighton, Tom Clancy, Douglas Preston, and Neal Stephenson.

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