The Constant c

The constant \( c \) is the speed at which light travels in a vacuum, approximately 299,792 kilometers per second (about 186,282 miles per second). It’s a fundamental feature of the universe, meaning light always moves at this speed regardless of the observer or source. This constant plays a crucial role in Einstein’s theory of relativity, where it links space and time and helps explain how objects and energy behave at high speeds. In essence, \( c \) is a universal speed limit and a key element in understanding the fabric of reality.