*The crew of the U.S.S. Enterprise is free to move about the ship without the problems of weightlessness because of a network of small gravity 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 physics principles as the ship's tractor beams. Power is channeled into a hollow cylinder of anicium 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 Class M planet. Requiring only occasional energy, the rotor can continue to provide an attraction field for up to 4 hours after a power loss. *Source: Back of card