Several questions regarding the nature of the universe

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The discussion centers on understanding the size of the universe during the Photon epoch and the challenges in calculating it. While the age of the universe at this stage is known to be under 400,000 years, the exact dimensions remain uncertain due to the unknown expansion history. The surface of last scattering's diameter cannot be accurately determined without this information. Additionally, there is interest in estimating the pressure during the Photon epoch, but specific calculations or data were not provided. The complexities of these cosmic measurements highlight the ongoing challenges in cosmology.
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I have a few questions about the nature of the universe. I'll start with the first question:

What was the size of the universe in Photon epoch? (in meters or light years)

How can it be calculated? On the Internet, unfortunately I did not find accurate data.

Sorry for my english - it is not good :wink:
 
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We can calculate the age of the universe at any given epoch, but, the dimensions of the universe is more complicated. For example, we know the age of the universe was a little under 400,000 years when the CMB was emitted, but, not the diameter of the surface of last scattering. You would need to know the entire expansion history of the universe for that, which is unknown.
 
Ok, thx.

Another question: We can estimate what was the pressure in the Photon epoch?
 

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