When I am writing science fiction, sometimes I have to do research to make sure what I am talking about makes sense scientifically. With fantasy, you can pretty much make up any rules you want as long as they are consistent. With science fiction, you should be grounded in the real world as much as you can be. It is about getting the facts right. You should follow the laws of physics. Or, if you are going to break one (it can only be one) there has to be a logical reason for breaking it. It has to be scientifically plausible. My soon-to-be released Novella The Methane Sea takes place on a planet with methane ice (solid) and methane lakes (liquid), and methane in the atmosphere (gas). I had to look up the freezing point, melting point and boiling point of methane (at something like standard pressure). Even though I didn’t talk about those values in the story, I do talk about temperature changes, and the methane does change from one state to another, so I had to know what those v...