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Hence, the CMBR black body radiation in our universe PROVES that it is infinite in its size!
In addition to gravity, the shell theorem can also be used to describe the electric field generated by a static spherically symmetric charge density, or similarly for any other phenomenon that follows an inverse square law.
The photosphere of a star is an excellent example:https://en.wikipedia.org/wiki/Black_body#/media/File:Idealized_photosphere.png"An idealized view of the cross-section of a star. The photosphere contains photons of light nearly in thermal equilibrium, and some escape into space as near-black-body radiation."If that photosphere goes to the infinity, then as long as we will be in that photosphere we will get the BBR.
Yes, there is a simple explanation.It is called - infinite Universe.
Let's assume that we can set a cold gas at a Temp of 2.725K in insulated enclosure as an oven.The light that emitted from that cold Gas is reflected from the internal surfaces of the Oven. When the radiation confined in such an enclosure is in thermal equilibrium, the internal radiation will be as great as from any body at that equilibrium temperature".In other wards - we can get a black body radiation from cold gas that is placed in an enclosure oven
If we take out the internal walls, they all would still have a black body radiation.
So simple and clear!
The only limit is that we shouldn't be close to the edge of that infinite universe.
Z CMBR= (λobserved -λrest) / λrest = (2000 - 780) / 780 = 1.564
However, I have a strong feeling that it's better for me not to do so.
3. CMBR λrest = 780
Why do you insist to replace the λ with T in the CMBR redshift formula
Please be aware that the redshift formula is as follow:Z= (λobserved -λrest) / λrestWe already know that the λrest is equal to the peak in the CMBR (2.75K).So why we do not use the peak in the "Atomic hydrogen welding" to set the λobserved?At the maximal level of 6000 °C (or 6273K) the redshift should be about:Z = (6275 – 2.75) / 2.75 = 2,281At the minimal level of only 3400 °C (or 3673K) the redshift should be about:Z = (3673 – 2.75) / 2.75 = 1,334
Quote from: Dave Lev on 06/03/2023 03:20:253. CMBR λrest = 780Why?
So, why can't we use the 3000K of the hydrogen recombination process to extract the CMBR λres?
It's more complicated than that but very broadly, yes.