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Planck Temperatures

I’ve read of some incredibly large temperatures that emenate from stars. Many in the millions of degrees. How accurate are these claims,how do they tell the difference between say…9 million degrees and 9.5 million ? Is is done by measuring the brightness of the source along with distance and would not the fuel itself affect the brightness? I’ve heard that the big bang generated temps in the trillion degree range. How can that be measured or even assumed to be factual. Is it guesswork or is there proof ? There seems to be a physical limit to negative temperatures yet no limit for positive temps. Is that because all atomic activity stops @ -460 f ? I wonder too why no upper limt as I would think any and all (fuel) used to heat those high temps would disappear at some point.
Noviceily yours;
When I was told to question everything, I asked why.

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