Provide information on the speed of light and its implications in space travel.
The speed of light in a vacuum is approximately 299,792 kilometers per second (186,282 miles per second). It is the fastest speed at which information or matter can travel. The speed of light plays a crucial role in the theory of relativity, affecting how we perceive time and space. It also presents a significant challenge for space travel, as the vast distances between stars would require enormous amounts of time to traverse even at light speed.