Why did textbooks (when I was in high school 5 1/2 years ago) always associate photons with the visible light part of the EM spectrum. Wouldn't the radio, x-ray, gamma, etc. areas of the spectrum exist as photons too? What about the transverse waves; would it not form a helix shape instead of the classic wave pattern on a flat plane? The former seems more realistic to me. Do photons REALLY exist? Think about it - a particle of which there would be a finite number of in the universe. A light source emits a certain number of photons per 3 dimensional degree. Eventually, wouldn't said photons diverge enough that would render the light source invisible to any telescope (because no photons are available to enter the lens). It makes me think that radiation energy exists as a longitudinal wave (like sound through matter medium) but with some other unseen, unfelt, unknown medium. Your thoughts?