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The speed of light in a vacuum is exactly 299,792,458 metres per second (approximately 186,282 miles per second, or about 670,616,629 mph). This value, denoted by the letter c, is a universal physical constant. Light takes approximately 8 minutes and 20 seconds to travel from the Sun to Earth. In a medium other than a vacuum — such as water or glass — light travels more slowly; the ratio of c to its speed in that medium is called the refractive index. According to Einstein's special theory of relativity, no information or matter can travel faster than light in a vacuum. The speed of light is a fundamental constant that appears throughout physics, most famously in the equation E = mc².
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