The speed of light is 299,792,458 meters per second and that constant tells us much about cause and effect in the universe.

How does light impact your health? Let's bring it back to high school physics: Light is a form of electromagnetic radiation that travels as waves of energy.

The speed of light is the fastest anything can travel. What happens to a photon from a galaxy 25 million light years away on its journey toward Earth?

How long would it take to travel to Jupiter at the speed of light? Light travels at approximately 186,282 miles per second (299,792 km per second).