[edwin hubble]

The 20,000 degree temperature gives the characteristic blue-violet color.

Yes, that is much hotter than the surface of the sun.

But it is much less than the fusion temperature at the center of the sun. (by a factor of several hundred).

[Arkie2]

The next step will be to try and measure the temp in the interior of the bubble if that's feasible. One researcher has reported detecting neutrons as a result of his experiments but there were several problems with the way he conducted them and a BBC special a few weeks ago purported to debunk his results. In any case, these experiments are revealing new information. It will be interesting to follow the results.

[bvw]

Been there have you? Of course not. You have a theoryM a theoretical model that predicts a certain temparature. You don't know. There are other models that predict the surface phenonemum we can observe, iirc.