Australian scientists have built device that generates a tractor beam, commonly considered a figment of alien abduction scenarios and Star Trek. The researchers’ creation thus far is capable of transporting small objects distances of up to five feet, using only a beam of light, Popular Science reports:
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Using only light, Australian researchers say they are able to move small particles almost five feet through the air. It’s more than 100 times the distance achieved by existing optical “tweezers,” the researchers say.
Not quite a simple grabby tractor beam, the new system works by shining a hollow laser beam at an object and taking advantage of air-temperature differences to move it around.
It works by shining a hollow laser beam around small glass particles, as Inside Science explains. The air around the particle heats up, but the hollow center of the beam stays cool. The heated air molecules keep the object balanced in the dark center.