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The speed of electromagnetic radiation is a constant. Its value is exactly

299,792,458 metres per second (about 186,282 miles per second) in vacuum,

somewhat slower in material media.

To give you some kind of a feeling for that speed, it would be the equivalent

of 7 1/2 times around the Earth in one second.

The speed is the same for all electromagnetic radiation. Gamma rays are one form

of it. Others include radio, microwave, visible light, ultraviolet, X-rays, etc.

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