Sunchaser said (in the Mars map thread): "I wish every sci-fi rpg included a first person common man perspective of his surroundings." I think this is a very good point: making the setting come alive by the little details. We should try to fill in the details about the varied environments of the solar system. Maybe this is best handled as separate threads for different worlds. Just selecting a place "randomly", consider Titan. How does it feel to be there? The gravity is 0.14 g, slightly less than the Moon. If you drop something on Earth it falls to the floor in about half a second. On Titan it takes three times as long. Ordinary walking is tricky unless done very slowly: on Earth ordinary walking speed is around 1.5 m/s. On Titan it will be about 0.6 m/s - a slow pace. On Earth we start to run when moving faster than 2.0 m/s, on Titan the shift occurs at around 1 m/s. So people will be loping or bouncing in everyday life, unless they try to preserve dignity by walking at a very slow and stately pace. See this essay, and for more science this article if you got Nature access. Titan is rotating synchronously, meaning that Saturn always stays in the same place in the sky. On half the moon it is not directly visible. Although it might be hard to see it anyway. The atmosphere is so dense and opaque that it is hard to tell where the sun is; the light levels are probably dusk-like. The normal temperature outside is −179.5 °C. A lot of the crust is ice, which means that buildings need to avoid leaking too much heat to melt their foundations. In addition there is an atmosphere that will easily be warmed by a building. Hence there is a need for plenty of insulation to avoid both losing heat for the inhabitants and unsettling the environment too much. A typical titanian arcology will still have a noticeable updraft of heated The surface pressure is about 1.45 times that of Earth's. Since buildings are going to be heavily insulated and airtight, this might be a minor issue. Except that any leak will tend to suck in titan air into the building. Most of titan air (98.4%) is nitrogen, but there is methane (1.4%) and hydrogen (0.1-0.2%). Methane is flammable only over a narrow range of concentrations (5–15%) in air and hydrogen requires at least 4% to be explosive, so a leak will not be an immediate explosion danger. But it will be fiercely cold, freeze water vapour into mist and contains a lot of somewhat nasty chemicals like cyanogen and benzene. Most likely the leak smells like a sniff into a petrochemical factory. The dense air and low gravity allows flying outside with very minor fins attached to a spacesuit, and with slightly bigger wings indoors.