crash course light

did you know there are kinds of light that you cant see like radio waves i think are a form of light or energy light is an energy have you ever tried heating up an iron bar until it glows yellow or red or blue it is emitting energy yellow is the strongest meaning it is the hottest and brightest if you look at 2 squares that are more or less the same color red but there is a very faint change in them there are machines that can see these different change but they don't see it like you see it they see it in wavelengths the tighter the wavelength the more energy a gamma-ray is the strongest radio is the weakest but still pretty strong and here are also ultraviolet and so on