The speed of light is a fundamental constant, approximately 299,792,458 meters per second. It's the same for all observers and hasn't changed measurably over billions of years. Nothing can travel ...
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Physicists “Slow Down Light” to Just 61 Kilometers per Hour Using Ultracold Quantum Matter
The speed of light is often regarded as the ultimate cosmic speed limit, but researchers have now managed to slow it down ...
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