[text] ET2EEI Al Images Videos News Maps Shopping Settings Aliregions v Safe searchoff v Anytime v Speed of light Wikipedia W httpsen wikipedia orgwikiSpeedoflight 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 pe second approximately 300 000 kms or 186 000 mifs.
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