Indeed, “in a lab”.
They haven’t verified the average temperature of planetary bodies, they just say they have.
My physicist “girlfriend” claims I am afraid of them being right. I am way too old to give a shit about anyone being right.
The angle I went down was to try and find a model which seeks to verify the number the Stefan-Blotzmann equation gets too.
Nothing.
The “lab” experiments involving Tungsten filiments etc are hardly a planet.
If it were not for the ability of modern technology to model a virtual planet, I could forgive the certainly they have in that equation.
Try and find someone who has modelled, using geological data of the conductive properties of soil a “virtual” earth sans atmosphere and oceans…Nada.