It travels faster than anything else, yet it's 8 minutes late. It makes your skin feel warm, yet you cannot touch it. It has no visible colour, yet at the same time makes 7 distinct colours.
Visible light is all around us. We see it, We feel it, We make use of it. For a second, close your eye and try to observe what colour you see. Difficult to see? Well, that's what would be if the sun was never there.
