What is really defined as sci-fi?
I've seen some people (John Scalzi specifically) use this as a definition for hard SF, and he goes on to include things like Star Wars in science fiction, where I would categorize it as science fantasy.
But if you accept those technologies as speculative "science", then Star Wars does qualify as SF. An important point, early SF tended to speculate on what "science" might eventually bring to pass, not on any actual theories (there are some important exceptions).
"Hard" SF is a relative term. A very "hard" SF story might still be softer than another SF story. I don't assign a border between the two, but rather by the principles that govern them. "Hard" SF is the kind of thing that contains detailed and plausible technology/engineering, while "soft" SF has little or no justification for the technology explored other than saying "it's science". However, simply making the claim that something is made possible by "science" does allow a story to treat the essential question that motivated much early SF, "Supposing we can, does that mean we should?"
In other words, "science fiction" is a story in which "science", whether accurate or even plausible to actual engineers, appears as an important dramatic element. This definition isn't universal, since what one person regards as "science" would be called "fantasy" by another (and vice versa). I don't regard anything in Star Wars as being remotely connected with actual science...but it is connected with the popular view of what science may achieve.
Or more simply, if you call it "science fiction", then you mean that you think it is fiction about science
Along that line, my novel has a similar situation. In the events of the novel, very little occurs that wouldn't happen in a fantasy setting, though I have grounded it in plausible science as much as possible and there is no magic. My world, like Pern, was settled by colonists, and does have science fiction roots, including genetic manipulation.
When I am looking for an agent or publisher, should I tell them I'm sending a fantasy manuscript, or sci fi, or a science fantasy?
Once one get beyond a certain amount of time, one can do anything you want as long as it is plausible. If you can figure out a scientific reason for something, including magic, then it is science fiction.
Then of course, there are the "what if" type stories such as "what if aliens appeared in times square, or What if an asteroid hit three mile island. Again, if you can find a scientific excuse for something, you can do it, including a scientist in a dying universe creates a portal which allows the denizens, which we picture as evil, to enter our world and we have to use new found magic to defeat them.
Hard Science Fiction is where you take an invention, a technology, a social pattern and extend it to the logical conclusion.
Soft science fiction is where the science fiction is the scaffold around which your useful idiot gets into trouble.
Science fantasy, like Star Wars, uses science fiction as a backdrop, and usually involves magic and other things we might see in fantasy stories.
As to what editors are after, they might have a bit different definition.
To me, Star Wars is not science fiction because it posits the Force, which we have no reason to think is a real feature of the universe. But if you want to argue that we just haven't discovered it yet . . . well, okay. Be that way. I won't fuss.
As for Pern: "Weyr Search" the independently-published first portion of the first novel, began with a description of the Pern colonists having been abandoned and reverting to a more primitive status, as well as of the "wandering" planet that the system had captured in recent millenia and the mycchorizoid nature of thread. Despite that, and the repetition of that information in a prologue in every book afterwards, the books read and felt like fantasy, and if you find the original Ballantine paperbacks and look, they say "fantasy" on the spine, not "science fiction."
For publishing categories? If it has trees, it's fantasy. It it has machines, it's sf.
However, even that definition doesn't quite cut it, since a story about a woman elected President of the US would actually qualify as sf under it, even thought it most certainly wouldn't be considered such (unless there were other elements in the story to justify that classification). That's probably where the "science" thing comes in; the difference has to be somehow scientific or technological somehow.
Trying to determine what is sci-fi and what is fantacy is futile in many cases, since a single story can easily have elements of both.
quote:
I would tend to argue that (Star Wars) should be called techno-fantasy
I categorize Star Trek as science fantasy also. It has to do with Larry Niven's bolognium. One piece is almost required for SF. Two a good writer can get away with. Three takes a grand master to pull off. Four, you're in science fantasy.
I have a lot of trouble with the whole sci-fi/fantasy destinction myself. My problem is that my story should probably be classified sci-fi over fantasy because it deals with science, but it isn't weird enough for a sci-fi publisher; it's more fantasy. :::sighs::: I've already reworked the thing three--no, four times, so I don't really want to do it again just to please a publisher.
Orson Scott Card's Sci-fi and Fantasy book is on my list of books about writing that I need to buy. Now if only I had money. :-)