Answer: The speed of light in a vacuum is approximately 299,792 kilometers per second (km/s).
The speed of light in a vacuum is a fundamental constant in physics denoted by the symbol “c.” It is approximately 299,792 kilometers per second (km/s) or about 186,282 miles per second. This value represents the speed at which electromagnetic waves, including visible light, propagate in a vacuum.
The speed of light is a universal constant and a fundamental principle in Einstein’s theory of relativity. According to this theory, the speed of light is the maximum speed at which information or matter can travel through space.
In a vacuum, light travels at its maximum speed, and this speed is the same for all observers regardless of their motion relative to the source of light. The concept of the speed of light plays a crucial role in various scientific disciplines, including astronomy, physics, and cosmology, influencing our understanding of the nature of space, time, and the universe. The speed of light is often used as a benchmark for expressing distances in astronomical units and light-years.