Speed of light is 299, 792, 458 m / s

The speed of light in vacuum, commonly denoted c , is a universal physical constant important in many areas of physics . Its exact value is 299,792,458 metres per second (approximately 3.00 × 108 m/s , or 186,282 mi/s); it is exact because the unit of length, the metre, is defined from this constant and the international standard for time.

The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light.