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Researchers in Europe have developed a “tractor beam” made of sound waves, but don’t expect any Star Trek-style starship towing just yet. Asier Marzo, a Ph.D. student at the Public University of Navarre, worked with professors from the Universities of Sussex and Bristol to produce what they call an “acoustic hologram” that can hold small objects, move them around and rotate them, and — earning the technique its “tractor beam” moniker — pull them in.
It works by sending out ultrasound vibrations that interfere and harmonize with each other, affecting the air molecules and forming an invisible — but tangible — shape.
“It is the same as when you go to the doctor for an echography or when they destroy kidney stones with ultrasound,” wrote Marzo in an email to NBC News. “We are going to try to apply the same principle but for manipulating…
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