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the wheels is done by transferring momentum to the second set of wheels, discharging energy through the power system, and using the hydrazine thrusters. The hydrazine tanks are located within the main truss between the flywheels, encircled by the main fuel tanks (so they may be cooled by the same refrigeration units). The nozzles are located on the circumference of the spacecraft pointed in each axis direction. The flywheels will be used for attitude control in the star system phase of the mission, and in the Centauri system. The hydrazine system is primarily used as a backup.
