The speed of light is 299 792 458 m s-1.
This is one of the very few exact physical constants; it is so by definition.
This enables the meter to be determined by it and the second.
Chat with our AI personalities
The speed of light in vacuum is 299,792,458 meters (186,282 miles) per second.
The speed of light is not limited in a vacuum - the speed of light is fastest in a vacuum. But that is what Einstein called the "Cosmic Speed Limit" - nothing can move faster than the speed of light in a vacuum, or even quite asfast.
The speed of light in a vacuum is 299 792 458 meters per second or 983,571,056.43045 feet per second or 186,282.397 miles per second or 670,616,629.2 miles per hour.
About 2/3 its speed in a vacuum.
The speed of light is 186,000 miles per second in a vacuum.