If you write science fiction, don’t violate the known laws of physics without providing rationale for doing so. Invent new laws if you like, but make them believable. A lot of technical folks are likely to be in your audience and you’ll lose them forever if your science isn’t credible. Noises in the vacuum of space (like the explosions you hear in movies), earth-like gravity on a small asteroid, and unrealistic orbits are some of the things to look out for. If you don’t know something that relates to science, look it up or ask someone who does. Satires (such as “The Worst Man on Mars”) have a bit more latitude.