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Light completely stopped for a record-breaking minute

作者:宁懂佥    发布时间:2017-12-02 07:00:10    

THE fastest thing in the universe has come to a complete stop for a record-breaking minute. At full pelt, light would travel about 18 million kilometres in that time – that’s more than 20 round trips to the moon. Light was first stopped in 2001 for a fraction of a second. Earlier this year, researchers kept it still for a record 16 seconds using cold atoms. To break the minute barrier, George Heinze and colleagues at the University of Darmstadt, Germany, fired a control laser at an opaque crystal,

 

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