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Revision as of 17:30, 31 October 2001 by 193.203.83.xxx (talk) (Created)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)(Most) current physical theories hold that the speed of light (and all other electromagnetic radiation) is constant, ragardless of time and place, or reference frame. This has been confirmed in our immediate neighborhood in space and time to a high degree of accuracy.
In physics, the speed of light is given the symbol c.
Following the consequences of this idea led Albert Einstein to develop the Theory of relativity.
The speed of light is a defined constant, as both the SI unit of length and SI unit of time are respectively defined in terms of wavelengths and cycles of light.
Thus, the speed of light is exactly 299,792,458 metres per second.