From Hidden Frontier
A tractor beam is an attenuated linear graviton beam used by starships and space stations to control the movement of external objects. The beam places spatial stresses on the object allowing the ship or station using the tractor beam to hold the object in a fixed location, tow it or alter its position and/or trajectory. Tractor beams can also be set to repel objects.
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 This article incorporates material from Memory Alpha, the free online Star Trek reference. More extensive information on Tractor beam can be found there.
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