What is the speed of light in the vaccum?
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The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is defined as 299 792 458 metres per second (approximately 300 000 km/s, or 186 000 mi/s).
kilometres per hour: 1080000000
metres per second: 299792458
miles per hour: 671000000
miles per second: 186000
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