Black body radiation has never been observed outside of a cavity filled with soot or graphite....
“
Black-body radiation is the
thermal electromagnetic radiation within or surrounding a body in
thermodynamic equilibrium with its environment, or emitted by a
black body (an opaque and non-reflective body).
So much for the claim that those atoms who’s electrons are jumping up and down between energy states are in thermal equilibrium with its environment...... were they such they would not be gaining and loosing energy.
Yes, I am aware they have fooled most into thinking blackbody radiation is commonly seen, but it doesn’t exist in nature. Just in laboratories in little soot or graphite lined boxes.....