Scientist in Scotland have slowdown the speed of of light.
The Scottish scientists sent photons- individuals particles of light - through a special mask. it changed the photons shape - and slowed to less than light speed.
The photons continue at the slow pace even when they returned to free space.
The experiment is likely to alter how science looks at light.
The scientist - from Glasgow and Heriot-Watt universities - are members of the Scottish Universities Physics Alliance. They have published their results in the journal Science Express.
The speed of light is regarded as an absolute. It is 186,282 miles per second in free space.
Light propagates more slowly when passing through materials like water or glass but goes back to its higher velocity as soon as it returns to free space again.
Or at least it did until now.
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