The two Hubs that are the base for the Suite Towers counter-rotate in order to provide an ever-changing direction in which to view Earth and the Universe, to properly manage heat buildup and to provide additional stability. The rotation rate is slow enough so as to not induce motion sickness; more on the order of a minute hand than a gyroscope. The five cylindrical sections that form the main structure of each hub are roughly the size of Shuttle External Tanks. A Shuttle is shown on the Alpha Docking port for scale. It will be replaced with a current generation passenger transfer vehicle.
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