light is vibrations from another dimension. It behaves like particles and like waves depending on how you look at it. Trouble is the theorists cant proove physics with experiment at the outer boundaries because the energies are too much.. so its all maths and guesswork.
@ the OP - the problem with exploring the makeup of quarks and below is that in order to view things at a sub atomic scale, you need to physically interact with it. Looking at an apple is easy - we know it's there because the photons reflecting off it are absorbed by our eyes. At the smallest scales, photons don't interact with many particles, and just to compound things, we know that free quarks don't exist!
This is where theoretical particle physics comes in, and unfortunately, turning theory into fact gets harder the more layers of the onion you peel away.