Fantasy is totally wide open all you really have to do is follow the rules you've set. But if you're writing about science you have to first learn what you're writing about.
The thing about science fiction is that it's totally wide open. But it's wide open in a conditional way.
Next Article
In teaching man experimental science results in lessening his pride more and more by proving to him every day that primary causes like the objective reality of things will be hidden from him forever and that he can only know relations.