Light is the only kind of energy that we can see. It moves about a million times faster than sound, and it can travel through empty space. Some things, like the Sun, make light. But most of the things we see do not. Instead, they reflect some of the light that falls on them. Light normally travels in straight lines, but it can be made to change course, and it can be split up into different colours.
Why is light made of?
Light is pure energy. You cannot touch it or pick it up, but whenever it shines into your eyes, you can see that it is there.Light energy travels in pulse called waves, and the distance between the wave decides its colour. In blue light, for example, the wave are about 0.0005 mm (0.00002 in) apart, roughly 200 times narrower than a human hair. Light belongs to a whole family of waves that includes X-rays, microwaves and radio waves.
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