Science fiction first requires you decided on your science. What you can envision and how far out you intend for the vision to go. Then you have to build a world which feels real to your characters and later the readers.
After all that you have to keep track of everything or in later books you may include something or call something different than in your original book. Think about it this way if I saw I saw a coffee pot on the counter you can easily picture what I am talking about. But lets say I want to use a replicator for storage. How you have to somewhere in the book explain how it works while keeping the flow of the story going. That comes back to deciding how I am going to present my science. I can use tried and true references from other science fiction or I can use the idea partially and alter it to fit more along the lines of science I have put forth in the book itself.
All this said I still have to convince you the reader that what I put on the pages is a real possibility. Not by actually sticking to hard science but by making it believable.
It is the same for places. They are all made up. At least in my book. They all exist in space somewhere we have never been and once more I am forces to figure out a way to explain something about this place. Think of it like this, if I am writing a love story and I say it is a beautiful spring day in Paris I don’t have to say anything else. You, the reader gets the picture. Short and sweet. So I can move right on to the gist of the scene without much enhancement. But, I am not able to do that with a place no one has seen. Nor am I able to make a comparison to Paris or anywhere else you the reader can relate to because Paris in my book does not exist at this time.
So as you can see what is rather simple and straight forward in a story in our time, whether a love story, crime, thriller, political or otherwise referencing to what a reader is familiar with is not viable. Worse as the builder of my world sometimes I am so familiar with it I forget the reader is not and have to check for those times I reference things the reader might have not idea about.
Yet, I believe my readers to be smart enough to figure out things referenced over and over so I spend little time explaining them. Like the word “turn” in my book. The use of it depicting the word “day” is easy enough once you get in a chapter or two to understand exactly its meaning and reference. So in those cases I do not elaborate the meaning, you the readers will get it. Leaving me able to move on to my scene without the elaboration.
So this is how My Science is created.