How Cosmic Background Wave Radiation Provides the Evidence of Big Bang a very Important Question ?
The Big Bang theory begins with a very hot universe. So hot that we know “normal” matter cannot exist at that temperature. (We know because we can see what happens to particles when we subject them to extremely high energy collision (providing the equivalent of high temperature) ) We also know that the average temperature of the universe today is a somewhat “cool” 2.75 K (less than 3 degrees above Absolute zero). We also know (because this is easy to do in a lab) that hydrogen atoms cannot be neutral at temperatures above 3000 K (roughly 5500 F). Why? because the heat energy is greater than the binding energy that tries to keep the electron in orbit around the proton. So, in the early, hot universe, the protons and neutrons exist separately. They are simply charged particles, freely moving around. Free charged particles interfere with light. A photon of light just loves to interact with a free charged particle. This menas that a universe hotter than 3000 K is NOT transparent. The light
