Oh, I do. I just didn't find it funny at all. 

Try this thought experiment.

"Why do the regions in the voids have a temperature if there is no particles" ? Why would the temperature be so close to the baryonic regions?

 You read up a bit on Bose-Einstein and Fermi Dirac. So you probably know you can calculate the number density of any particle species once you know that particles cross section via its temperature contributions.

So answer this How can we get such close temperatures when the number density of baryonic matter between voids is negligible compared to the number density in the filaments?

PS it was your mind fried comment that reminded me about this

(keep in mind via the same statistics above and combining spectronomy spectral indexes, we can measure the baryonic contributions and isolate their contributions based upon measurement data) ie photons, neutrinos ( different EoS than next list, ) hydrogen, lithium etc. The last comment on EoS ties into the Baryon accoustic oscillation data correspondence to temp/pressure relations.

 The internet is full of the hydrostatic Euler and Jeans equations in examination of Dark matter distributions which gets far deeper to apply it to BAO but these are the rudimentary basis behind BAO examinations of Dark matter regions.

 

Edited October 11, 20178 yr by Mordred