Tractor beams — which allow spaceships to pick up and shift objects without physically touching them — have long been a staple of science fiction.

Previous attempts to build them have relied on inducing electric or magnetic charges, using heat to create air pressure differences, and even attempting to manipulate gravity. However, a physicist has proposed and intriguing new possibility — one that uses nothing but light.

Keep Reading: Could Tractor Beams Be Made From Light? | Wired Science | Wired.com.