Would anyone here be able to explain how any of this works? I have been trying to figure this out on wikipedia etc. but it is not good enough. I have a few questions:

How do you see these parts of light?

Are there creatures with the ability to see ultraviolet and infrared? Why can people not? What would it look like?

In theory, would a creature be able to see would they be able to see even further like gamma rays and radio waves?

When does this light spectrum stop?

In theory, would a creature be able to only see outside of the normal spectrum?