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Speed of Light May Not Be Constant, Physicists Say


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Abstract speed of light

Einstein's theory of special relativity sets of the speed of light, 186,000 miles per second (300 million meters per second). But some scientists are exploring the possibility that this cosmic speed limit changes. CREDIT: Iscatel | Shutterstock ]

Credit: Iscatel | Shutterstock

The speed of light is constant, or so textbooks say. But some scientists are exploring the possibility that this cosmic speed limit changes, a consequence of the nature of the vacuum of space.

From LiveScience
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