I learned that all material objects emit electromagnetic (light) radiation. But, we can only "see" visible light. I'm aware that non-visible light is 'invisible' to us; however, I was wondering about this. Doesn't the sun emit UV light, and isn't it visible to us? Rather, I should ask, isn't the source of the UV light (the sun) visible?
If an object emits any type of EM radiation, will it be technically visible? Thank you.