![]() ![]() ![]() ![]() Instead, Einstein had an unexpected-and paradoxical-insight: that light from a moving source has the same velocity as light from a stationary source. Surprisingly, the answer has nothing to do with the actual speed of light, which is 300,000 kilometers per second (186,000 miles per second) through the "vacuum" of empty space. No matter how you measure it, the speed of light is always the same.Įinstein's crucial breakthrough about the nature of light, made in 1905, can be summed up in a deceptively simple statement: The speed of light is constant.
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