Speed of light - Wikipedia 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)
How Fast Does Light Travel? | The Speed of Light - Space 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)
What Is the Speed of Light? - Science Notes and Projects 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
The Speed of Light: Why It’s the Ultimate Speed Limit 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
Speed Of Light | COSMOS - Swinburne The speed of light in a vacuum is 299,792,458 metres second (though it is less in a transparent medium such as air, water or glass, depending on the refraction index)
Light Speed, the Universal Speed Limit – Astronomy Tips 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