Humanoid organ systems require gravitational and electromagnetic fields to insure proper cellular growth and viability, simulating the natural conditions present on most Class-M worlds. Low-level field devices simulated the planetary electrical and magnetic energy, and descendants of many twenty to thirty year flights arrived in a healthy state,

   The general planform of the Galaxy class starship returns to a more natural existence, in that people are free to move about on planar surfaces with a constant gravity holding them to the deck. Aboard the starship, this is accomplished through the use of a network of small gravity generators. The network is divided into four regions, two within the saucer module and two within the battle section. All four work to maintain the proper sense of down, and are also actively tied to the inertial dampening field system to minimize motion shock during flight. The two saucer module gravity networks each support 400 generators; those in the battle section each support 200. Fields overlap slightly between devices, but this is barely noticeable.

   The gravity field itself is created by a controlled stream of gravitons, much like those produced by the tractor beam. In fact, the basic physics is the same. Power from the electro-plasma system (EPS) is channeled into a hollow chamber of anicium titanide 454, a sealed cylinder measuring 50cm in diameter by 25cm high. Suspended in the center of the cylinder, in pressurized chrylon gas, is a superconducting stator of thoronium arkenide. The stator, once set to a rotational rate above 125,540 rpm, generates a graviton field with a short lifetime, on the order of a few picoseconds. This decay time necessitates the addition of a second layer of generators beyond 30 meters distance. The field is gentle enough to allow natural walking without a gravity gradient from head to foot, long a problem in brute-force centripetal systems.

   The superconducting stator remains suspended from the time of manufacture, and requires only an occasional synchronizing energy pulse from the EPS, normally once each sixty minutes. In the event of EPS failure, the stator will continue to provide an attraction field for up to 240 minutes, though some degradation to about 0.8g will be detected. Any perceived ship motions that might disturb the stator gyroscopically are dampened by sinusoidal ribs on the inner surface of the anicium titanide cylinder, effectively absorbing motions with an amplitude of less than or equal to 6cm/sec. All higher amplitude motions are relieved by the ships inertial dampening field.

   Gravity generators are located throughout the habitable volume of the spacecraft. Because of this, inertial potential can vary from one location within the ship to another, especially during severe turning maneuvers. In order to allow translation of excess inertial potential from one part of the ship to another, the gravity generators are connected together by a network of small wave-guide conduits that allow field bleed for gravitational stability.

   In the TOS episodes "Arena", "Tomorrow is Yesterday", and "Where No Man Has Gone Before" a voice in the background can be heard saying "Gravity down to point eight" during emergency situations.

   So why did the Klingon ship lose gravity in ST6? In TOS "The Changeling" there are gravity palettes, and in ST5 and ST6 there are gravity boots, indicating that self contained, low power gravity generators that can be quickly turned on and off exist. The Klingons probably used something more akin to this gravity generation system aboard the warship than what the Federation uses.

   Gravity generators measure 8.34 centimeters in length by 5.29 centimeters thick by 13.52 centemeters in length. These plates are installed in 5-by-5 matrix mats containing 25 blocks. This allows the mat to produce the optimal gravity conditions of 1.00 g. If in emergency conditions, the power is removed from these mats, they continue to create gravity for aproximately 48 minutes.

   The crew of a starhsip is free to move about their ship without the problems of weighlessness because of a network of small generators working together to provide the proper sense of "down". The gravity field itself is created by a controlled stream of gravitons, using the same principles as the ship's tractor beams. Power is channeled into a hollow cylinder of anicum titanide 454, where a superconducting rotor of thoronium arkenide is suspended in a pressurized chrylon gas. Once set into motion, the rotor generates a graviton field gentle enough to simulate the gravitational pull of a standard M-Class planet. Requiring only occasional energy, the rotor can continue to provide an gravity field for up to 4 hours after a power loss.