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The speed of light in vacuum, denoted c, is a physical constant that is exactly equal to 299,792,458 metres per second (approximately 186,282 miles per second, or one foot per nanosecond).
The speed of light in vacuum, denoted c, is a physical constant that is exactly equal to 299,792,458 metres per second (approximately 186,282 miles per second, or one foot per nanosecond).