So the gas giant in Avatar rotates about 50 times faster than Jupiter. Winds on Jupiter can exceed 100 meters per second, so the winds on Polyphemus would have

So the gas giant in Avatar rotates about 50 times faster than Jupiter. Winds on Jupiter can exceed 100 meters per second, so the winds on Polyphemus would have to exceed 5000 m/s – this is supersonic and clearly implausible. That's odd. I don't think there is substantial proof that winds on Jupiter are caused by planetary rotation. In fact, the atmosphere is part of the same inertial system as the rest of the planet. Here's an article suggesting that the winds are actually generated from within Jupiter's interior: http://www.spacedaily.com/reports/Jupiters_Massive_Winds_Likely_Generated_From_Deep_Inside_Its_Interior.html http://www.spacedaily.com/reports/Jupiters_Massive_Winds_Lik... Additionally, I see no inherent problem in supersonic winds. How does it preclude a foreign planet from being 'plausible'? If there is a problem, I'd like for somebody to help me identify it.