Speed of light
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The speed of light is the speed of electromagnetic waves. Light travels at slower speed inside materials like glass or water; its highest speed is in a vacuum. The speed of light in vacuum is a univer
One of the last and most accurate time of flight measurements, Michelson, Pease and Pearson's 1930–1935 experiment used a rotating mirror and a one-mile (1.6 km) long vacuum chamber which the light beam traversed 10 times. It achieved accuracy of ±11 km/s.
Hendrik Lorentz (right) with Albert Einstein (1921)
Electromagnetic radiation
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In physics, electromagnetic radiation or an electromagnetic wave is a self-propagating wave of the electromagnetic field that carries momentum and radiant energy through space. It encompasses a broad
Speed of light
…The speed of light is the speed of electromagnetic waves. Light travels at slower speed inside materials like glass or water; its highest speed is in a vacuum. The speed of light in vacuum is a universal…
James Clerk Maxwell (1831–1879)
Aurora Space Shuttle EO