Speed of light

The speed of light in vacuum, commonly denoted, is a universal physical constant important in many areas of physics. Its exact value is (approximately, approximately 186,282 mi/s); it is exact because the unit of length, the metre, is defined from this constant and the international standard for time. According to special relativity, is the maximum speed at which all matter and hence information in the universe can travel. It is the speed at which all massless particles and changes of the associated fields (including light, a type of electromagnetic radiation, and gravitational waves) travel i
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