I'm doing some world-building at the moment for a fantasy setting and would like some help, please. When it comes to physics etc, I'm like the kid who looks at the cool pictures of kung fu masters doing awesome kung fu stuff; less experienced than the student wielding a brand new white belt. Some guidance from you kung fu masters would be beneficial. Here's the general concept: 1. The setting is located in a binary system with a sun slightly larger and brighter than our own, and one about half as such. 2. More precisely, the setting is a moon that orbits around a gas giant, which in turn orbits the two stars within the system's Goldilocks zone. 3. The gas giant is approximately the size of Jupiter, with 4-5 total moons. 4. The second moon is where everything within the setting takes place; although slightly smaller than Earth, it is more replete with heavy material, and thus of nearly equal gravity. So here are my first set of questions: 1. What is necessary to include in this setting to ensure that earth-like civilizations could develop? For example, shielding from radiation, tidal forces from the gas giant, etc? 2. What kind of tidal forces would the moon experience from both the gas giant and the other surrounding moons? I'm assuming that a moon with sufficient distance from the gas giant wouldn't be trembling with volcanic activity. 3. What kind of weather effects would be occurring as a consequence of having a giant ball of gas hovering nearby? Would it be, all things considered equal, warmer/dryer/wetter than Earth? 4. Would reflection from the gas giant negate darkness in whatever regions of the moon were facing the gas giant, but not the suns? 5. How would light from the suns work? Would they appear as a large blob of light or separate points? Would they "rise" and "set" together? What about shadows cast by objects? 6. Would it make more sense to have the suns closer together and all of the satellites circling both or have one stationary and the other moving?