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Message: <blockquote data-quote="Xeviat" data-source="post: 5342919" data-attributes="member: 57494">Is anyone still interested in working on this? I've been reading to put together as much information as I can about Gliese 581g specifically. I'm sure more information will come together later, but here is what I've found so far: * It orbits Gliese 581 every 37 earth-days. Night-siders would know this because of the rotation of the stars; it seems like it would take 18 and a half days for a star to transit the entire sky, so this period should be important to the people. * It is tidally locked, or nearly tidally locked. I'm going to stick with a full tidal lock, because that's the main element to this world. This means the planet is orbitting its access every 37 days, which will create some centrifugal effect. Venus, for instance, rotates (retrograde) its own access every 243 days, while it rotates the sun every 224.7 Earth days; sunrise to sunrise is 117ish Earth days. The point of all this is that Venus has very fast winds at the high altitudes, but very slow winds at low altitudes (average like 1 meter/second). The winds rotate in the same direction as Venus, but they're faster than the rotation. There's a lot going on here, but I mean to show that 581g's winds don't have to be only from solar-pole to night-pole. The convection-based wind from equator to pole is much slower than the wind that flows around the planet. I'd like to discuss this more to decide on a wind pattern for the world; since it doesn't rotate like Venus or Earth, whatever rotational winds that might be caused will probably be overriden by the convection. There might be a trend for air to move along the equator more, since the surface is rotating faster there then at the poles. * Temperatures are expected to be around 160 at the day side and -25 on the night-side; I don't know if this was supposed to be F or C, so I'm still looking. * As long as the world's atmosphere is at least 10% as thick as Earth's, it shouldn't "freeze out" (where the atmosphere freezes at the night-pole and dries out completely at the day-pole). * Higher gravity will compress the atmosphere. Depending on what you want out of the setting, you could have a higher pressure atmosphere by having an atmosphere as relatively voluminous as Earth's, or you could have an earth pressure or lower atmosphere by having a lighter one. A thick atmosphere would facilitate flight, which would make the whole airship idea someone had earlier more possible. * 581 g is more massive than Earth, but if it is as dense as Earth it will have a larger diameter. Gravity on a sphere is measured as if the mass was concentrated at the center, so being further away lessens gravity. Gravity on 581g should only be 1.1 to 1.7g's. With higher gravity, I'm leaning towards liking a thicker atmosphere so flight is still feasible. Just some thoughts here. I'm going to use 581g as a model for a fantasy setting as well, but I like to model the mundane in reality.</blockquote>

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