@xavier666@lemm.ee If you sit at a magnesium fire, it burns at 3300K, which is hot enough to produce sizeable ultraviolet rays. So you can get your sunburn from that, damaging the DNA in whatever of your remaining cells have not been melted away by heat.

Thanks. I completely forgot that the standard suntan or sunburn is caused by UV rays. A fireplace doesn't create UV rays.

Heat is also (thermal) radiation. So is light, radio waves, microwaves, etc. However, the radiation from a fire or the other stuff I mentioned isn't ionizing, so unless the heat itself does damage it won't do cellular damage.

You also give off thermal radiation, but so does anything higher temp than absolute zero.

Hahaha that's a good one

Isn't most of that radiation blocked by the outer layers of the sun, though? Like, sure, there is a non-negligible amount of high energy photons escaping, but the overwhelming majority of the radiation comes AFAIK from blackbody radiation from the plasma at the temperature of the surface of the sun?

And yo, mate, how's it goin?