A tractor beam is a hypothetical device with the ability to attract one object to another from a distance. Since the 1990s, technology and research has laboured to make it a reality, mostly at microscopic level. Less commonly, a similar beam that repels is called a pressor beam or repulsor beam. Gravity impulse and gravity propulsion beams are areas of research from fringe physics that coincide with the concepts of tractor and repulsor beams.
Famous quotes containing the word beam:
“How can one beam alone support a house?”
—Chinese proverb.