Everything in the Universe is made from one type of particle.
All workings of the Universe are result from said particle.
The particle itself would be just the grey threads (or strings) in the picture (no color and a lot thinner of course).
It would fit perfectly inside of a dodecahedron
Actual thread (or string) length is about one Ångström and it is fine enough where 10 threads (20 radii) could curl-up into the size of a neutron.
CMB is Redshifted Starlight
Everyone knows the further back you look through a telescope into the Universe the more things appear redshifted. If that same process continues the light would be shifted right off the visible spectrum and into the micro-wave. And that is what happened.
Micro-wave (or CMB) radiation is just light from stars that are very far away.
Remember Olbers' paradox? Why is the sky not bright if there is supposedly a star at the end of every point you look? There actually is -- but the light has been shifted.
This is why the CMB appears to be so smooth -- the Universe is filled (for all intents) evenly with stars so you will see just about the same things no matter where you look. A lot of it might be in a different spectrum though.
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