The sun is a star that sends out light. The light we can see is called visible light, meaning that it is light we can see with our eyes. Light is a form of energy, and in physics we say that energy gives something the ability to do work. Plants use light energy from the sun to make their own food in a process called photosynthesis, and light energy gives our eyes the ability to see the world around us. Light also comes from other sources than the...