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Source: https://writers.stackexchange.com/a/45013
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

The most important thing I recommend is to hold to [Sanderson's First Law of Magics](https://brandonsanderson.com/sandersons-first-law/):

> An author’s ability to solve conflict with magic is DIRECTLY PROPORTIONAL to how well the reader understands said magic.

While you draw the line between magic and science fiction, this rule is essential on both sides of the line. It's important because much of what makes science fiction fun dabbles along the edge. You have to be able to obey the laws of magic while you're teetering over on the magic side.

It also points directly at the key to your question. Your reader must understand the magic. If they understand the magic, they will give more leeway in the scientific plausibility. One pattern I have seen many times is to establish a character with scientific credibility, and then rely on them to give credibility to whatever you are writing.

Probably the most important thing to remember that's unique to science fiction is the flow of science. Science does not give any credibility to predictions outside of the status quo without experiments showing something different. People are trained to be skeptical of these things. If you have to violate a "currently known law of physics," you are going to want to make sure they can believe whatever experiments were done to move science in that direction. Thus, if you need FTL, pay attention to how the new rules might have been discovered. If you need to break the law of conservation of energy, make sure you do so gracefully. And, if possible, introduce these changes in a way that does not solve conflict. That way, at worst, readers can respond through Sanderson's Law.

And remember:

> We often think of scientific discovery with shouts of "Eureka! Eureka! I have found it!" and the subsequent public indecency as one streaks through Syracuse naked. Real scientific discovery rarely sounds like that. Far more often, it sounds like "Hmm. That's kind of funny."

Original score: 4