PX282 - A7 - inside a star

photons are released from nuclear-energy production, which do not get out easily
these photons are absorbed by material progressively further from the core in a random 'walk'
energy is transferred by photons, convection, atom collisions, magnetic field
the photons seen arise from near the 'surface', from material in thermal equilibrium
emission from a gas in thermal equilibrium can be approximated by black body radiation, which follows planck's law:

B_{λ} (T) = \frac{2 h c^{2}}{λ^{5}} (\frac{1}{\exp (\frac{h c}{λ k T})} - 1)

[B_{λ}] = \underset{e n e r g y r a t e}{\underset{⏟}{J s^{- 1}}} \times \underset{p e r u n i t a r e a}{\underset{⏟}{m^{- 2}}} \times \underset{p e r u n i t λ}{\underset{⏟}{n m^{- 1}}} \times \underset{p e r s t e r a d i a n}{\underset{⏟}{s t^{- 1}}}