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Speed of light not so constant after all: structure of pulses can slow down photons, even in a vacuum.
Light doesn't always travel at the speed of light. A new experiment reveals that focusing or manipulating the structure of light pulses reduces their speed, even in vacuum conditions.
A paper reporting the research, published online January 22 in Science, describes hard experimental evidence that the speed of light, one of the most important constants in physics, should be thought of as a limit rather than an invariable rate for light zipping through a vacuum.
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