The speed of light is approximately 186,282 miles per second, which translates to about 670,616,629 miles per hour. This incredible speed is a fundamental constant of nature and is denoted as "c" in physics equations. The speed of light is crucial in the realms of astronomy, physics, and many technologies such as telecommunications and GPS systems. It is also integral to Einstein’s theory of relativity, which postulates that nothing can travel faster than light in a vacuum. This limit shapes our understanding of space and time in modern physics.