PMR: only supercritical hydrogen can produce BB radiation at 6000 k. Std: fusion in core generates gamma rays that propagate through radiative zone, getting redshifted by a wide variety of non-BB processes WT: Electric current through Sun causes ohmic heating. MM: .7 Mm deep neon layer is 4000 K hotter than underlying silicon, so most of the BB radiation comes from the neon layer CLC: atomic oscillation in supercritical fluid (per Robitaille).