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October 21 2012

Tractor beam built from rings of laser light

Stand aside, Wesley Crusher: there's a new tractor beam on deck that pulls objects using nothing more than laser light. The device has already grabbed NASA's attention as it could one day prove useful on space missions. It is well known that light can push on objects – this is the basis for using solar sails to propel a spacecraft. But getting light to pull on something is a bit trickier.

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