Visible light, like all forms of electromagnetic radiation, travels through space at a constant speed known as the speed of light. In a vacuum, such as outer space, visible light travels at approximately 299,792 kilometers per second (or about 186,282 miles per second). This speed is often rounded to approximately 300,000 kilometers per second for simplicity.
The speed of light is an important constant in physics and is denoted by the symbol "c." It serves as a fundamental limit on the speed at which information and energy can travel through space.