Tractor beam
A tractor beam is a hypothetical device with the ability to attract one object to another from a distance. Since the 1990's technology and research has changed the tractor beam from science fiction to reality. However, there is no mainstream science which is equivalent to the magnitude in which it is used in science fiction but university research has allowed for advancement on the microscopic level (see optical tweezers). Tractor beams are frequently used in science fiction. Less commonly, a similar beam that repels is called a pressor beam or repulsor beam. The exact specifics vary, but there are generalities. Gravity impulse and gravity propulsion beams are areas of research from fringe physics that coincide with the concepts of tractor and repulsor beams.
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