Light is electromagnetic radiation, just like radiowaves, infrared radiation and x-rays.

Even though light travels at 299,792,458 meters per second (in a vacuum), it takes it years to travel across the vast distances in space.

It takes about 1.3 seconds for light or radio waves to reach us from the Moon.

Nothing travels faster than light.

Light takes four and half years to travel to the nearest star (other than the Sun), 100,000 years to travel across the width of the galaxy, and 100 billion years to travel across the observable Universe. (source)

A light-year (the distance light travels in one year), equals about 6 trillion miles.

Red, green and blue are the primary colours of light. Mixing them in various ways will make all other colours, including white.

Our main source of light on Earth comes from the Sun.