Lasers are able to drag small objects backwards towards their source, just like a tractor beam.
Unlike in science fiction movies, the lasers will only be able to pull very small objects towards them, not space ships. Scientists have known for a long time that light can push objects, and it is this that allows solar sails to propel satellites in space. Researchers in China and Hong Kong have discovered the very specific conditions that the laser must have to cause this effect. The new theory has been said to take ‘a radical idea forward’
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