That is a interesting question. From my point of view when your solving a physics problem I think it is only to what is reasonable to solve the problem. I was doing a problem in physics which required a answer from a geometry problem and some trigonometry for a electromagnetic wave. I guess it...
I think i understand your question. Yes we are seeing light waves of electromagnetic radiation that comes to us. When we see it we are looking at something that has happened in the past. That star when we see it may no longer be there. Light photons that we see are partcles that abide by...