What is the source of light's speed?

The speed of light is a fundamental physical constant that plays a crucial role in our understanding of the universe. It is defined as the speed at which electromagnetic radiation travels through a vacuum, and is approximately 299,792,458 meters per second (or about 670,616,629 miles per hour).

The source of light's speed can be traced back to the properties of space and time. According to Albert Einstein's theory of special relativity, the speed of light is a fundamental constant that is the same for all observers, regardless of their relative motion or the velocity of the source emitting the light. This means that light always travels at the same speed, regardless of the observer's motion or the motion of the source of light.

The theory of special relativity also predicts that as an object approaches the speed of light, its mass increases and its length contracts, which makes it impossible for an object with mass to travel at or faster than the speed of light. This is known as the theory's speed limit.