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Speed of light
Speed at which all massless particles and associated fields travel in a vacuum
The speed of light in vacuum, commonly denoted c, is a universal physical constant that is important in many areas of physics. Its exact value is defined as 299792458 metres per second (approximately 300000 km/sor 186000 mi/s). According to the special theory of relativity, c is the upper limit for the speed at which conventional matter, energy or any signal carrying information can travel through... Wikipedia
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