Ok back to the timeline. Now that we’ve explored the possibilities for how our current universe (the matter or possibly dark matter dominated universe) came to be, we can move on to what came before that, the light dominated universe. By ‘light’ I actually mean radiation, so that includes all forms of light from gamma to radio waves. Basically the universe had more photons than anything. Well how do we know there was a light dominated era? Because of the CMB! The cosmic microwave background, the precious baby of modern cosmology. All the cosmologist are so so so proud of the CMB, cause it validates a lot of their ideas. And brought down some of them as well. But anyway the cosmic microwave background is a layer of microwaves that are left over from the radiation dominate era of the universe. And as to how it works…I’ll talk about that later.
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