KENNEDY SPACE CENTER, FLA. - The Control Moment Gyroscope (CMG) is moved across the floor of the Space Station Processing Facility. It is being transferred to a stand prior to its being returned to the vendor for repair. The faulty CMG was removed from the International Space Station and replaced with a new one on mission STS-114 in August. A control moment gyroscope is an actuator used to apply very high attitude-control torques to agile spacecraft. The Space Station uses four massive control moment gyroscopes to maintain the Station’s orientation in space.
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