What is Light?

This question has puzzled people since forever!  Light is a form of energy.  We know this when we turn on the lamp next to our bed.  Sometimes it feels very warm to be too near it.  Just like sunlight on a sunny summer's day.  We also know that light is the fastest thing in the universe!  It travels at a speed of 186,000 miles per second. (Now that's fast!)

When light hits an object it bounces off.  That is called reflection.. Glass is transparent, you can see through it, so light passes right through it.  If you look around, most things you see are opaque, meaning you can't see through it therefore light will not pass through on the other side.