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The speed of light in vacuum, often called simply speed of light and commonly denoted c, is a universal physical constant exactly equal to 299,792,458 metres per second (approximately 1 billion kilometres per hour

700 million miles per hour). Light is a universal speed limit and, according to einstein's theory of relativity, is the fastest speed in the universe 300,000 kilometers per second (186,000 miles per second). Speed of light, speed at which light waves propagate through different materials In particular, the value for the speed of light in a vacuum is now defined as exactly 299,792,458 metres per second. Since 1983, the speed of light has been fixed by international agreement at 299,792,458 metres per second, mainly because the metre has been defined as the distance light travels in 1/299,792,458 seconds.

The speed of light is the rate at which light travels The speed of light in a vacuum is a constant value that is denoted by the letter c and is defined as exactly 299,792,458 meters per second. From the earliest experiments to the latest discoveries in cosmology and quantum mechanics, the speed of light remains the ultimate speed limit—an elegant, immutable boundary that continues to inspire wonder, challenge our intellect, and shape the very nature of reality. Leah crane explores the history of one of. The speed of light, sometimes abbreviated as c, is a universal maximum posted speed that causality will enforce It's the greatest speed at which any known substance or object can travel.

In a vacuum, light travels at a constant and finite speed of 186,282 miles per second (299,792 kilometers per second) which translates to about 670,616,629 miles per hour.

What is the speed of light The speed of light is a universal physical constant that is exactly equal to 299792458m/s).